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His chameleon clung to a branch with four prehensile claws . Or EP # 4 , in which the dominant primate was one with prehensile toes and a tail ? Rosetto explained Haeckel 's idea : the individual foetus in the womb ( that 's the " ontogeny " part , the development of the individual ) seems to go through all the evolutionary stages its species went through ( that 's the " phylogeny " part ) , mimicking gills , prehensile tail and so on , before becoming something more evolutionarily advanced than any of them . Even this limited prehensile power , however , is highly useful to the little fish , for with one fin or the other it often clings to stalk , blade , or float of the drifting weed in whose shelter it lives . Seahorses all have a prehensile tail .