Creatures of Greek Mythology by Emoji

You're right about hippogriffs. They were invented at the end of the sixteenth century by Ariosto. The first mention of a basilisk was by Colophon in the second century while the first mention of a harpy was by Hesiod in the seventh century, so you're correct about that as well. However, in Greek art, sirens are portrayed as half woman and half bird. The reason I did not use the snake emoji was because there is not one of only its head, and the head is what is infinite. Do you have other suggestions for the hydra? What is a creature I could substitute for the hippogriff?