"Those are the birds."

Translation: Boni hontesse issi.

[Balthers]

I'm very confused about whether birds animate or inanimate. I never know when to use kony/koni or bony/boni.

[Megyroncari]

For birds it really depends the point of view of the speaker.
So you can use kony/bony in singular or koni/boni for plural

[okopquadrat]

You can choose what they are. "y" stands for singular, "i" for plural.