Their tiny webbed feet gave them away.

A group of penguins was recently filmed attempting to carry out a daring escape inside a Denmark zoo. Unfortunately for the feathered friends, they left a wet trail of footprints behind them.

A zoo worker captured their breakout blunder on video, which shows the flightless birds frantically waddling down the halls of the Odense Zoo.

As the worker nears them, the tiny birds scramble away in a huddle, only to come to an apparent dead end and collectively turn back.