“ C. sclerops, the spectacled alligator, has the widest distribution, from southern Mexico to the northern half of Argentina, and grows to a bulky size. The largest, attaining an enormous bulk and a length of 20 ft. is the C. niger, the jacaré-assu or large caiman of the Amazons. The names “alligator” and “crocodile” are often confounded in popular speech ”