There is a strict hierarchy in crocodile groups, that is determined by size. Large, old males are at the top of this hierarchy and have primary access to food and the best basking spots. Crocodiles know their place in the hierarchical order and rarely act against it, but when they do, the results are very bloody and sometimes even fatal.
On average the Nile crocodile is between 4.1 metres (13 ft.) to 5 metres (16 ft.), weighing around 410 kg (900 lb.). However, specimens measuring 6.1 metres (20 ft.) in length and weighing 907 kg (2,000 lb.) have been recorded. Damn am I glad I’ve never met one of the big fellows… 6.1 metres is a bit big for even Tarzan to wrestle… The one below is a fair size…
The Nile crocodile is an ambush predator and can wait for hours, days and even weeks for the suitable moment to attack. They are quite agile predators and wait for the opportunity for the prey item to come close within the range of attack.
The bite force exerted by an adult Nile crocodile has been shown by Dr. Brady Barr to measure 5,000 lbf. (22 kN.). However, the muscles responsible for opening the mouth are exceptionally weak, allowing a man to easily hold them shut with a small amount of force.