Соотнесите заголовки с текстами. 1. How do crocs and alligators differ? 2. What surprises researchers about crocodiles? 3. Where do crocs migrate during cold months? 4. Why can crocs spend much time underwater? 5. What is the size of male and female crocs? 6. How do crocks hide before they catch their prey? 7. What makes crocs hunt successfully? A) Most reptiles have a three-chambered heart. But crocodilians have four chambers, as with mammals and birds. The croc heart also has a special valve that lets blood bypass the lungs, so oxygenated blood is reserved for the vital organs, such as the brain, while deoxygenated blood is re-circulated to the rest of the body, including the gut. This is why crocs can hold their breath for a long time. Adult crocs can stay under the water for over an hour. B) There are differences between the crocodile and the alligator. The three main ones are the family type, jaw shape and teeth placement. There are three families of crocodilians: the Alligatoridae, Crocodylidae and Gavialidae. Crocodiles are part of Crocodylidae. whilealligators are Alligatoridae. Alligator jaws are U-shaped like a shovel. Crocodile jaws are V-shaped with a narrow snout. An alligator's upper jaw is larger than its lower, completely overlapping it. Crocodiles, on the other hand, have equal-sized upper and lower jaws. C) Crocodiles have exceptional hearing, eyesight and smell. However the most sensitive pieces of sensory equipment are the dermal pressure receptors (DPRs) on every scale on their head. These allow crocodiles to detect vibrations of their prey, even while under murky water. They can then follow their prey underwater and, once close enough, explode out of the water and grasp the animals With their powerful jaws. These abilities make crocs hard to be found But they always know where youreflexes. D)Despite living in environments full of infectious microorganisms you rarely see a crocodile with an infection. Male crocodiles fighting over territories sometimes hurt each other badly with their powerful jaws, but, surprisingly, such wounds heal very well and pretty fast. The facts that crocodiles never get sick and that crocs wound heal well have puzzled scientists for ages. Some of them believe this may be due to a special compound in the blood. but this has yet to be proved. E) He saltwater crocodile is the largest living reptile in the world Males can reach close to 7m in length, and weights of more than 1t, but adult females rarely grow longer in Australia than about 3.5 m. Saltwater croc pairs may form long-term bonds. This has been observed in the tourist parks and in the wild. Some large males-- 'boss' crocs - maintain and guard groups of females in a territory that may include several kilometres of a river, which they patrol daily. F) There is a special pose that crocs are famous for. It is often shown in films before crocs attack. From the moment they hatch, crocs adopt this pose in water, with only their eyes, nose, ears and top of the head above water, and everything else hidden below. It makes them almost invisible in murky and dark water. This pose allows them to watch a potential prey closely and approach it without being noticed until they launch with lightning reflexes.