There are some symbols to choose from but only one can be used

There are some symbols to choose from but only one can be used. The answer is hidden as a missing word at the end of a short rhymed poem, e.g.: " Far, far away, in a forest dense and thick, lived a big bird with red feathers and a sharp …". Among the symbols, there are shapes of claws, feathers, fangs and a beak. The password is "beak".