A crocodile can't move its tongue and cannot chew. Its digestive juices are so strong that it can digest a steel nail.

The trickiest tongue twister in the English language is apparently "Sixth sick sheik's sixth sheep's sick". Give it a try and see for yourself.

The scarlet tanager, a songbird native to Illinois, can eat as many as 2,100 gypsy-moth caterpillars in one hour.

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