do you kown these thinks?

May 5, 2007 2:05am CST
1,a crocodile cannot stick out its tongue. 2,a dragonfly has a life span of 24 hours. 3,a shark is the only fish that can blink withboth eyes. 4,a goldfish has a memory span of three sconds. 5,a snail can sleep for three years. 6,an ostrich's eye is bigger than its brain. 7,butterflies tast with their feet. 8,cats have over one hundred vocal sounds.dogs oniy have about 10.
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