In the Spanish province of Álava (Basque Country), an event unprecedented in the world of birds of prey occurred. A pair of two female imperial eagles (Aquila fasciata) not only occupied a nesting site but also successfully raised three foster chicks provided by ornithologists. This case is the first documented for this species and is described in the Journal of Raptor Research
A new study by Russian scientists has shown that even with a stable population and abundant food supply, the timing of snowmelt is a decisive factor for gyrfalcon (Falco rusticolus) breeding in the Arctic Yamal Peninsula. Just one "bad" year can dramatically reduce nesting success due to simple ice buildup on the nests