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The article discusses a study which investigated the signaling role played by achromatic plumage patches and examined the patterns and characteristics of the brightness of Eurasian eagle-owl's white feather patches for adult and young birds. The study collected blood from breeders and young birds and measured the brightness of their white plumage. Results revealed that the total reflectance of the white feathers in young birds differed from that of the white feathers in adult owls and the brightness was distinct between the sexes only in adults.

The article presents a study on the breeding output and quality of chicks in the first and replacement clutches in the Eagle Owl Bubo bubo. The researchers collected chick measurements and blood samples when nestlings were about 30 to 35 days old. They also subjected the dependent variable nesting attempt to a generalized linear mixed model (GLMM) analysis assuming binomial error structure. They found that replacement clutches are important on the fecundity of big long-lived species like the Eagle Owl.