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Birding Longcanggou, Sichuan again (but maybe for the last time)

10,000 Birds

Apparently , they use the presence of their own eggs as a cue for recognizing parasitic eggs – so without the presence of their own eggs as a template they fail to recognize a parasitic egg. Some individuals even rejected their own eggs when they were in the minority. I guess people were more flexible then.

Eggs 164
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What the Owl Knows: The New Science of the World’s Most Enigmatic Birds: A Book Review

10,000 Birds

From Hiro, we learn how Northern Pygmy Owls are “rule breakers,” not incubating eggs till all are hatched and then raising owlets that mature at the same rate even though the eggs were laid asynchronously (as most owl eggs are). They are also hunted.

Owls 200
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Birding the Wolongshan area in June 2023

10,000 Birds

Indeed, most cuckoo eggs are accepted by the babax ( source ), although a small proportion of hosts reject cuckoo eggs and often boast about this capability when having a few too many drinks. Some Chinese Babax waste part of their lives feeding chicks of Large Hawk Cuckoos, which parasitize the babax species.