Gloop!

Ducks like mud. Ours have a very nice little pond which they do splash around in now and again. But they by far prefer to guddle in puddles. And the muddier the better. They also like to stick their heads in an old basin and do underwater quacking, which can be mistaken for very loud farts. They, and the boys, find this funny.

Although these could actually be footprints of the Creature from the Black Lagoon which was found in the other pond.