Eggs Japan Raised 
10,000 Birds
JULY 15, 2024
A paper on the species asks the important question “Does nest sanitation elicit egg rejection in an open-cup nesting cuckoo host rejecter?” ” To rephrase: if you put some trash into a nest of a bird along with a cuckoo egg, does that improve the chance that the cuckoo egg will be kicked out? How to find out?
10,000 Birds
SEPTEMBER 9, 2014
They bred on a number of islands near Japan and Taiwan, and ranged widely and abundantly from the Aleutian Islands south through California. The most notorious effect is that their eggshells become so thin that a parent bird will crush it’s eggs while attempting to incubate them.
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10,000 Birds
NOVEMBER 10, 2022
Of course, it is hard to resist looking at a paper titled “Host personality predicts cuckoo egg rejection in Daurian redstarts” Basically, the personality of a female redstart (bold or shy) predicts the responses to parasitic eggs – bold hosts are more likely to reject parasitic eggs.
10,000 Birds
MAY 25, 2023
While having somebody else raise your chicks like an attractive strategy to me, it is not without dangers. Not only does this species directly parasitize other species but also metaphorically, by imitating the sparrowhawks in its appearance and thus deterring potential predators.
10,000 Birds
JULY 4, 2023
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).
10,000 Birds
DECEMBER 8, 2022
Acariformes: Syringophilidae) from the Chestnut-eared Bunting (Passeriformes: Emberizidae) in Japan (morphology and DNA barcode data)” Ah, to be a scientist. In contrast, the females need to make sure not to get duped into raising actual cuckoos – the buntings are a targeted host species ( source ). Better safe than sorry.
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