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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.