Dung beetle
Scarabaeus satyrus
An African dung beetle shapes a ball of dung and rolls it away from the pile in a straight line, because a straight line is the fastest way to escape other beetles trying to steal it. On clear moonless nights, the beetles still roll straight.
Researchers moved beetles into a planetarium in South Africa. With only the Milky Way projected on the dome, they rolled as straight as under a full starry sky. With no stars at all, they wandered. Their eyes are too weak to pick out single stars, so they use the glowing band of the galaxy as a guide line.
It is like driving across a desert at night by keeping the Milky Way on your left.
