Crocodiles at birth are around 20 cm (8 inches) long - not much longer than your feet!
Saltwater crocodile: 4.3- 5.2m
Nile crocodile: 4.2m
American crocodile: 4.1- 4.8 m
Depending on the species (there are 23 species!), adults may vary in size from about 1m to 7m, and can weigh more than 1.5 tons or over 3,000 pounds.
The largest recorded crocodile was 7 meters (23 feet) long See a video of Gustav, the Giant Crocodile of Burundi (9 minutes; warning: fascinating, but may be scary; parental guidance recommended; contains some subtitles)
Whilst some species can gallop, the fastest way for many croc species is a "belly run". They move like a snake, wiggle their legs. and their tail whips back and forth. By belly-running, crocs can reach speeds of around 10 or 11 kilometres an hour (around 7 mph), or faster if they're sliding down muddy riverbanks.
A human can outrun a crocodile and crocodiles being ambush predators they will not pursue you for very long.
Crocodiles are 'ambush hunters'. They wait for fish or land animals to come close, then rush out to attack. They grab their prey with their strong jaws, drag it into the water, then they roll over and over ('death roll'). This confuses the prey and eventually it drowns. Then the crocodile begins to eat.
Crocodiles mostly eat fish, other reptiles, and mammals, and sometimes other water creatures such as mollusks and crustaceans.
Stones are often found in the stomachs of adult crocodiles. Why?
The stones may help the crocodiles digest their food.
The stones may help the crocodiles to balance in the water (see ballast).
Crocodiles digest everything they eat, including bones and shells, because their stomachs are so acidic.