Some megafauna, informally

RHINOS

These heavyweight herbivores with distinctive horns are often found in African savannas and are known for their thick, armored skin.

"Some megafauna, informally" points to large animals, and "megafauna" is a scientific term for big creatures like elephants or whales. The clue uses "informally" to hint at a casual or shortened name—here, "rhinos" instead of "rhinoceroses." It’s a straightforward definition with no wordplay, just a nod to how we often talk about these animals in everyday language.