Where does “ωοτόκος” come from?

ωοτόκος (Greek) comes from Ancient Greek ᾠοτόκος, from Ancient Greek ᾠόν, from Proto-Hellenic ōyyón, from Proto-Indo-European h₂ōwyóm, from Proto-Indo-European h₂éwis — bird.

ωοτόκος (Greek): oviparous, egg laying