The shape of the snout. The crocodile's snout is pointed and V-shaped, and the alligators are wide and U-shaped.
Location. Alligators are only found in parts of the US and China, whereas crocodiles can be found across the world. Scroll down for more information about where you'll find each.
Habitat. Crocodiles prefer water that is more saline or salty than the alligator's preferred freshwater habitat.
Toothy Grin. Crocodiles can't hide their teeth, but alligators' teeth are sometimes hidden when their mouths are closed.
Size. A full-grown crocodile will likely be several feet longer than an adult alligator.
Color. Crocodiles are generally lighter in color than alligators.
Speed. On land and in water, crocodiles are usually slower than alligators.
Behavior. In terms of aggression, an alligator might seem tame compared to a crocodile.
Note the pointed, v-shape of this crocodile's snout. The alligator's snout is more wide, rounded, and shaped like U
.
The alligator's snout is a more rounded U shape. The differences in snouts probably evolved due to dietary differences, with alligators needing to crack open turtle shells.
Here's a close-up of the crocodile's teeth with its mouth shut
Can an alligator and a crocodile have kids together?
No, because although they might look fairly similar, they belong to separate species (Alligatoroidea and Crocodyloidea). This essentially means that they are too different genetically to produce children. So don't expect to see any "crocogators" soon!
An unmanned aerial vehicle, commonly known as a drone, is an aircraft without a human pilot onboard. UAVs are a component of an unmanned aircraft system; which include a UAV, a ground-based controller, and a system of communications between the two.
The first drone! Compilation of several models.
The most common drone in the consumer market is the Parrot AR. Drone 2.0 which he found in the ranking of the best gadgets of the year 2012. Although it is small it allows for many. It has a built-in webcam that will record video in 720HD. An improved control system and the ability to form their own wifi network are just a few of its advantages. The price is not high, you can now buy it for $ 300.
Another model worthy of attention, this Phantom DJI GPS, this model was equipped with a host of modern features, GPS, autopilot, and auto-landing when the battery is low. This drone can safely mount the GoPro HERO webcam example. You do not have to worry about whether your drone disclaims because it is programmed so that coming back to the last location that you took off. Price? $ 700
Another interesting model is the H-King Darkwing, which was designed specifically with the first-person view. His wingspan allows for a lot of cargoes. You can attach the webcam or the radio. It is very light, and its price is tempting, only 167 $.
The next suggestion in this article is Lehmann LA100 Drone GoPro, this model is made of foam and carbon fiber which makes it very light and able to work in difficult conditions. The wingspan is over 1m, as the name suggests has a GoPro camera. Price as possibilities is very good because it costs $ 1,330
At the end of the shift here Micro Drone model, its dimensions are really small so that you can freely fly it in the house without worrying about the own family members, pets or expensive things. He can rotate the site of 360 degrees. It is small and compact, and the control is not much of an issue. A good suggestion to start an adventure with drones, also because of its price is 107 $
Things you need to know about drones
UAVs, first developed by the military in the 1990s, are a mind-blowing innovation. They spark curiosity and wonder. Quadcopter Arena presents a few myths and debunks them with a few drone facts.
Interesting drone myths
There are many things about UAVs that you may believe, but they are myths. It can be quite difficult for you to separate fiction from reality. These interesting facts about drones will help you debunk long-standing myths, and put things in perspective.
1. A Model Airplane is a Drone
One of them is that a model airplane is a drone. Drones are machines that fly without a pilot controlling them. In contrast, pilots fly model airplanes within their line of sight. A model airplane cannot move out of a pilot’s periphery of vision, which disqualifies it as a drone.
2. Drones are like surveillance cameras
Drones may seem like street cameras because they have the same functions. Both survey and record images.
Contrary to this belief, they are not like surveillance cameras because they take to the air. They fly and can follow a person’s movements wherever they go.
You may have to merge the feeds taken by surveillance cameras. Drones have a continuous live feed and can capture images without interruption.
3. Only the police and the military use drones
Drone uses have expanded. Many civilians fly them these days. Modern ones like the DJI Phantom 3 or the Nano QX bring joy to many avid hobbyists.
4. Police need a warrant if they are flying a drone below 400 ft
The police often use aerial vehicles to survey backyards for marijuana. You may think that they need a warrant if they fly a drone below 400 feet.
The US Supreme Court has found that it is not a violation of constitutional rights to fly a drone at a low altitude. The ruling enables the police to use such devices to fight crime.
5. The police cannot use the footage delivered by drones
Using drone footage is not a violation of constitutional rights either. As long as an officer has the right to be at a crime scene, he can use the evidence he collects. The same applies to drones. The police can use the footage drones record, as long as it this is not done in a restricted area.
6. Flying drones does not take skill
Contrary to what you may believe, achieving control of a drone’s pitch and yaw takes practice. Experienced pilots can make a drone dance in the air.
7. All drones have weapons
Not all drones do. Drones help people in many ways. While some drones have military uses, others are used for photography and other purposes.
8. Drones cannot stay in the air for long
Lightweight drones like the Blade Nano QX or the Hubsan X4 cannot remain in the air for more than 10 minutes.
Not all drones are mini-drones. The DJi Phantom drones can stay in the air for about half an hour. US military drones can hover for many hours at a time.
9. There are more downsides than upsides to using drones
You may have heard horror stories of low durability, crashes and short flight time. But the advantages of using drones outweigh their disadvantages.
Manufacturers are blending robotics, airframe design and sensors in many ways. These innovations have created jobs and increased the competitiveness of companies.
15 Surprising facts about drones
There are many fun facts about drones waiting for you to discover. Many of them are historical in nature. Others are simply frightening. In all, they will definitely floor you.
1. The first drones targeted terrorists
The first military drone, the Predator, targeted Osama Bin Laden.
The United States built the first drone before the 9/11 attacks, but it was not ready for deployment. The first drone killing was in 2001 when UAVs shot Muhammed Atel, an Al Qaeda commander.
2. Military uses for drones are increasing
Drones do not just track and survey the enemy. They bear powerful weapons and are lethal devices.
3. Attack drones need people to man them
That all drones are autonomous is a misconception. The higher the attack capability of a drone, the more people need to man it.
4. Israel was the first country to build drones
The first country to manufacture drones was Israel. Israel Aerospace Industries has production facilities about 24 countries around the world.
5. Drones have taken many lives
According to the Federal Bureau of Investigation, attack drones have killed about 4756 people. Many were children.
6. Drones help humanity
There are many things a drone can do. Besides having military uses, they enable communication in inaccessible areas. They also survey land for real estate purposes.
7. Drones fight crime
The police use them for tracking purposes. The aerial footage they capture serves as evidence to convict criminals.
8. Drones deliver food and medicine
You may not realize how helpful drones are. Many bring food and medicine to people in war-torn areas.
9. They are excellent farming tools
Drones are great farming assistants. They survey crops, and their footage will show farmers the damaged ones.
10. Drones cover important events from the air
Drones can help you to record important sports games or celebrations from the air. With a drone, you will never miss a fireworks display.
11. Theater companies use drones to decorate stages
A drone is a stage manager’s best friend. It dangles decorations as it hovers in place.
12. The Aerial Target was the first attempt at building an aerial vehicle
The Aerial Target made my A.M. Low, was one of the first attempts at putting a UAV together.
13. Americans are the highest users of drones
Over 181000 Americans have registered their drones with the Federal Aviation Administration of America. Stores report selling over 400000 drones.
There are many unregistered American drones. Failing to register an American drone can lead to a fine of $27500.
14. Drones spark creativity
Drones attract creative minds. They have sparked creativity in the areas of robotics and military defense.
15. Industry players disagree about what to call drones
Some industry players call these vehicles UAVs, and others, RPAS (Remotely Piloted Aircraft Systems). They feel that RPAS are different because a pilot controls them from a distant location.
Ten Myths About Drones
Myth #1: A model airplane is a drone.
A drone is an unmanned aircraft that can fly autonomously–that is, without a human in control. By contrast, model airplanes are largely flown within visual line of sight and in the presence of an operator who watches and maintains control of the airplane during flight. That alone is enough to place model airplanes cleanly outside the boundaries of the definition of a “drone.”
Myth #2: Drones are no different than street surveillance cameras.
The ACLU, the Center for Democracy and Technology, the Electronic Privacy Information Center, and other organizations have raised concerns over the privacy issues associated with the use of drones. One of the first questions privacy advocates get about UAVs is how they differ from the street cameras many cities already employ. But drones are very different from fixed cameras because, most fundamentally, they fly. Not only can drones monitor public spaces, but they can also see any area visible from the air. Drones can also be used to follow a suspect from place to place without having to merge multiple videos feeds from different fixed cameras. Finally, attitudes toward drones appear to differ than attitudes toward more familiar cameras, creating an opportunity to reexamine privacy law.
Myth #3: Drones can only stay in the air for a short amount of time.
Another common belief about non-military UAVs is that they have a short flight time and range. Many battery-powered UAVs are indeed limited to flight times of well under an hour. However, there is enormous variety in the shapes, sizes, and capabilities of UAVs. Some U.S. military UAVs can stay aloft for many hours at a time and have a range of thousands of miles. Boeing is currently developing the Solar Eagle, a solar-powered UAV that will be able to stay aloft at very high altitudes for five continuous years.
Myth #4: Only the police can use dronesMyth #4: Only the police can use drones.
Much of the attention regarding domestic drones has been concerned with their likely use by law enforcement agencies. But there are many other potential applications as well, including agriculture, surveying, news reporting, and firefighting. And Congress has charged the FAA with developing a plan to integrate many more private drones in the nation’s airways by September of 2015. The impact of drones in the United States will be profound — and will go well beyond law enforcement applications.
Myth #5: Police need a warrant to observe you with a drone flying below 400 feet.
There is a 1989 Supreme Court case, Florida v. Riley, where police flew a helicopter at 400 feet in order to look at a backyard and greenhouse for evidence of marijuana cultivation. The Court found no constitutional privacy violation. Four of nine justices remarked that a helicopter is allowed to fly at 400 feet, adding “We would have a different case if flying at that altitude had been contrary to law or regulation.” One justice agreed with the holding but wrote separately, reasoning in part that “there is considerable public use of airspace at altitudes of 400 feet and above.” Presumably based on this language, it has been suggested that a warrant is needed to operate a drone for surveillance purposes below 400 feet. But nothing in either the four-justice plurality or one-justice concurrence in Riley — or any other Supreme Court case — supports this bright line view.
Myth #6: Police flying a drone to the scene of a crime can only use footage acquired at the crime scene itself.
Another misconception is that police who are flying a drone to a specific location such as a crime scene or emergency cannot use the footage the drones gather on the way to that location. Generally speaking, if an officer has a right to be somewhere — whether a sidewalk, stairwell, or helicopter — she can gather whatever evidence she can see, smell, hear, or record. The same is likely true of drones. Of course, it may be a matter of best practice only to record the activities of citizens when necessary. But it is not a constitutional limitation; “incidental” drone surveillance may well be in the cards.
Myth #7: The Supreme Court’s January 2012 decision in Jones (the warrantless GPS tracking case) means that police need a warrant to follow your car using a drone.
In the recent case of United States v. Jones, the Supreme Court held that officers generally need a warrant to follow a vehicle with a GPS device continuously for an extended period of time. A majority of justices (five of nine) expressed a general concern with sustained surveillance by electronic means. Technically, however, the Jones case was decided on a narrower basis: five justices thought that the act of affixing the GPS device to the car was itself a kind of trespass to personal property, thus triggering a Fourth Amendment violation. Drones do not need to be affixed to anything, so the Jones ruling won’t necessarily limit how they might be used for surveillance.
Myth #8: Most “drones” used by the U.S. military overseas are armed.
Many of the impressions regarding drones come from media coverage of military UAVs. In particular, UAVs are often described in the press as firing missiles at insurgents or terrorists. It turns out, however, that the overwhelming majority of U.S. military unmanned aircraft are unarmed, and are used to acquire imagery. In many cases, this imagery provides vital information that can help save the lives of American troops on the ground.
Myth #9: It doesn’t take any flying skill to operate a U.S. military “drone.”
Sometimes you hear the disparaging claim that UAVs, unlike fighter jets, is easy to fly. U.S. military unmanned aircraft such as the Predator is capable of autonomous flight but are piloted by extremely skilled aviators. Thanks to a combination of technology advances, these pilots no longer need to be physically sitting in the airplane. But that doesn’t make them any less skilled in most respects than traditional in-the-cockpit pilots. Indeed, many U.S. military unmanned aircraft pilots prefer not to use the term “drone,” as it fails to recognize the high levels of skill and extensive training behind real-world flight operations. Instead, they often use terms such as UAV or RPA (“remotely piloted aircraft”).
Myth #10: The downsides of drones in U.S. airspace outweigh the benefits.
Like almost any technology, drones can be misused. It’s important to put in place appropriate frameworks to ensure that they are operated responsibly. In doing so, however, we shouldn’t lose sight of the bigger picture: The domestic use of drones will provide a long list of benefits. They can provide vital, lifesaving imagery in many different scenarios. The drone community, which includes companies, universities, and hobbyists, is merging robotics, sensors, and airframe design in an amazing variety of innovative ways. These innovations, and jobs they create, both now and in the future, can help American competitiveness not only within the drone industry but also more broadly.
The lion has forever been a symbol of strength, power, and ferocity. During WWF tours to Africa, seeing the majestic species up-close is sure to be a spine-tingling experience.
10. African lions are the most social of all big cats and live together in groups or “pride.” A pride consists of about 15 lions.
9. Male lions defend the pride’s territory while females do most of the hunting. Despite this, the males eat first.
8. These majestic cats are threatened by habitat loss. The lion is listed as vulnerable on the IUCN Red List of Threatened Species.
7. The lion was once found throughout Africa, Asia, and Europe but now exists only in Africa with one exception. The last remaining Asiatic lions are found in Sasan-Gir National Park in India, which was primarily created to protect the species. Currently, there are approximately 350-400 lions in the park.
6. A lion’s roar can be heard from as far as 5 miles away.
5. A lion can run for short distances at 50 mph and leap as far as 36 feet.
4. Even though the lion is sometimes referred to as the “king of the jungle,” it actually only lives in grasslands and plains. The expression may have come from an incorrect association between Africa and jungles or may refer to a less literal meaning of the word jungle.
3. A good gauge of a male lion’s age is the darkness of his mane. The darker the mane, the older the lion.
2. A lion’s heels don’t touch the ground when it walks.
1. A lion may sleep up to 20 hours a day.
Living in the grasslands, scrub, and open woodlands of sub-Saharan Africa, the lion is the second largest cat in the world (behind tigers).
African lions are the most social of all big cats and live together in groups or “pride.” Although extremely large pride, consisting of up to 30 individuals, have been observed, the average pride consists of five or six females, their cubs of both sexes, and one or two males (known as a coalition if more than one) who mate with the adult females.
Lions live for about 10-14 years in the wild. While in captivity they live for as long as 20-25 years old.
The average male lion weighs around 180 kg (400 lb) while the average female lion weighs around 130 kg(290 lb).
The heaviest lion on record weighed an amazing 375 kg (826 lb).
Lions can reach speeds of up to 81 kph (50 mph) but only in short bursts because of a lack of stamina.
An adult male’s roar can be heard up to 8 kilometers (5 miles) away.
Male lions are easy to recognize thanks to their distinctive manes. Males with darker manes are more likely to attract female lions (lionesses).
African lions eat large animals that they find in the grasslands, including antelopes, zebras,and wildebeest.
A female lion needs 5kg of meat a day. A male needs 7kg or more a day.
The females in the pride tend to do the majority of the hunting. They work as a group and use intelligent hunting tactics to catch prey which they would not be able to catch alone as they are faster than them.
Lions have terrific night vision. They are 6 times more sensitive to light than humans. This gives them a distinct advantage over some prey species when hunting at night.
Lions enjoy relaxingand lazing around. They spend between 16 and 20 hours each day resting and sleeping. They have few sweat glands so they wisely tend to conserve their energy by resting during the day and become more active at night when it is cooler.
At3 to 4 years old, males and females are ready to mate. The female has a gestation period of around four months. She will give birth to her young away from others and hide the cubs for the first six weeks of their lives. At birth, the cubs are only around 1.5 kg (3 lbs.). They are also completely dependent on their mother.
Lionesses are caring mothers who will even take care of a neglected cub, allowing him/her to suckle and giving them a chance to survive. Two or more lionesses in a group tend to give birth around the same time, and the cubs are raised together. Cubs are extremely playful.
Female cubs stay with the group as they age. At around two years old, they become capable hunters. But young males are forced out of pride at that age.
Lions are symbols of strength and courage and have been celebrated throughout history for these characteristics. They are also common symbols for royalty and stateliness, hence the phrase ‘king of the jungle’.
Ancient Egyptians venerated lions as their war deities due to their strength, power, and fierceness. The famous sphinxes are just one of many mythical depictions of the lion in Egyptian culture.
The lion population in Africa has been reduced by half since the early 1950s. Today, fewer than 21,000remain in all of Africa.
