Nest?

Nest?

Observation - Nest? - Global. Description: I noticed this mound in my pond after investigating a splashing noise while passing. It doesn't look natural but I'm not sure that it actually is a nest. There are moorhens on the pond and I have been told that little grebes have nested here in the pa

I noticed this mound in my pond after investigating a splashing noise while passing.
It doesn't look natural but I'm not sure that it actually is a nest.
There are moorhens on the pond and I have been told that little grebes have nested here in the past.