Only one way to find out. And yeah, it's possible -- easy!

[In fact, did you blink? Because in that blink of an eye, Killua's got the chicken thing cornered, picking it up by its feet, somehow, and dangling it in front of his face. It squawks and screams and struggles, but unfortunately for it, Killua's got a death grip.]

I guess we've gotta figure out if these things have genders and if it matters in egg-making.