“His partner is in heat, and the bachelor is pumping with testosterone. He needs to release his energy and show who’s boss, even if his sparring partner weighs 1.7 tons,” the zoo said.

NEW: Small deer takes on a 1.7-ton rhino at the Wroclaw Zoo in Poland.

The deer was seen headbutting the rhino, named Maruska, before chasing it around in the enclosure.

“His partner is in heat, and the bachelor is pumping with testosterone. He needs to release his energy and… pic.twitter.com/WkdMlOf9Kh

— Collin Rugg (@CollinRugg) January 9, 2026