Crocodile

Being reptiles, crocodiles were quite vulnerable to cold, becoming slow and sluggish if exposed to it.
Their four legs, though short, were noted as being quite powerful in terms of propelling them rapidly through their watery habitats.
Crocodiles mated once every year, laying clutches of up to 60 eggs that they then buried beneath sand. Unlike some reptiles, a female crocodile was known to carefully guard her clutch of eggs against any potential predators. When the eggs eventually hatched the mother would assist her young in getting free of the sand, but thereafter would leave them to fend for themselves. As a result, typically very few hatchlings would manage to survive to maturity.