The Moosey cats spend quite a lot of time on the pond decking - fishing for frogs. Green frogs often live in the pond from summer on, and they hide in the vegetation on the edges.
Fishing for Frogs
When the cats catch a frog they bring it into the house. The noise a captured frog makes is quite disturbing, and I'll often release it into the water race. Find a safer pond, little green frog!