Synecdoche (συνεκδοχή understanding one thing with another) is the use of the part for the whole, or the whole for the part. The name of an animal is often used for that which comes from, or is made from, the animal. Cp. “they sought his blood”; “Belinda smiled, and all the world was gay”: Pope.
δόρυ ship for plank, beam, ἀλώπηξ fox-skin for fox, χελώνη tortoise-shell for tortoise, πορφύρᾱ purple dye for purple-fish, ἐλέφᾱς ivory for elephant, μελίσσα honey for bee.