In this video, a coot couple defends their nest against a great crested grebe couple; while a male mallard swims past.
Annet Piet from the Netherlands made the video.
Cheriet, S., Samraoui, F., Alfarhan, A. H. & Samraoui, B. (2015). Factors affecting nesting success in the Great Crested Grebe Podiceps cristatus at Lake Tonga, north-east Algeria. Ostrich 86(3): 239-245: here.
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