Birds are avian enemies found on Ape Atoll, Crash Island and inside the Nature Altar. They attack with melee and can be assigned as Slayer assignments by Turael. Although they are airborne, they use melee.
The ones in the nature altar are blocked off, and as such can only be attacked by ranged and magic. Once dead they fall to the ground, but drop nothing.
For the birds slayer task, you can instead kill other birds such as chickens.