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A new study shows that chickens, which don't have teeth, still have the genes that make them, and in special cases, those genes can be switched back on. Scientists now think that as animals evolve, they lose the ability to turn those genes on at the right time during development â not the genes themselves.he notion that chickens can't make teeth has been around a good long while. But in 1821 a French zoologist named Geoffroy Saint-Hilaire tried challenging it. In an article entitled (French Spoken), On the Teeth of Birds, he described sharp brown structures beneath the beaks of parrots he was studying.
âT. rex had a mouth full of serrated teeth; the largest tooth of any carnivorous dinosaur ever found was 12 inches (30 centimeters) long. But not all teeth of T.rex performed the same function. Specifically, the dinosaur's front teeth gripped and pulled; its side teeth tore flesh, and its back teeth diced chunks of meat and forced food into the throat.