November 2017 - Kathy Reid

Male adult Grebe feeding a feather to a chick.

One suggestion is the ingested feathers form a plug in the pylorus, between the stomach and small intestine, which acts as a strainer to keep fish bones in the stomach long enough to be completely digested.

crested grebecrested grebe chickchickmale grebefeatherwaikuku lagoon

From Australasian Crested Grebe