Butting

Tom doesn't want Mary butting in.

Why does Tom keep butting in to our conversation? He doesn't even know Mary.

Two he-goats, belonging to his herd, were jealous of one another, and at last engaged in fight, butting at each other so violently that one of them had a horn broken, and ran away in great pain, bellowing loudly.

Sami and Layla started butting heads together.

Sami and Layla started butting heads.

Talking birds, goats butting heads, and a giant tortoise that hangs out with chickens are all part of a living classroom. High-school students at the Career Center in Arlington, Virginia are learning firsthand, and hands-on, how to care for animals. They are at the animal science laboratory, learning about, and taking care of, about 50 species of animals.

He was constantly butting heads with her.

Without buttings or boundings on any side.

[…] when they grew up to adolescent muttonhood, it required all the prowess and interference of the papa sheep to prevent them from breaking each other's skulls by their constant tiltings and buttings.