Harmoni Photography Great Crested Grebes - Harmoni Photography
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The adult Grebe chased its chick with this feather for a while. Apparently the chicks are meant to swallow the feather in order to line their stomachs. The feather acts as a 'filter', keeping nutrients in the stomach longer, and possibly as a protection from fish bones.

Harmoni photographyMonika J WrightGreat Crested GrebechickfeatherceremonyparentalbehavioursweetPerthWestern Australia