Crocodile can easily digest a steel nail
Crocodile is really a fearsome and dangerous creature which swallows it’s pray as a whole. Its tongue is attached to the roof of its mouth by a membrane due to which it can't stick out or move its tongue. This makes it incapable of chewing its food. Still, crocodiles are capable of swallowing and digesting steel nails and even pieces of pots, glass and pans because their bodies have highly acidic and strong digestive juices that can dissolve steel nails and other hard materials quite easily.