Using drones to monitor bird nests

In late winter 2013/14 the crow fieldwork crew of the Wolf Lab at the Evolutionary Biology Centre in Uppsala, Sweden, started planning the next field season. The goal was to sample two dozen hooded and carrion crow nestlings from sites in Sweden and Germany...

Male testes come in all shapes and sizes

Male testes come in all shapes and sizes. Male mammals usually have two testes that are equal in size but birds, for some unknown reason, usually have one testis bigger than the other, and it is often said that the left testis is larger than the right.

A canary for climate change?

Modern-day puffins and auks have long been recognized as environmental indicator species for ongoing faunal shifts, and fossil records now indicate that ancient relatives were similarly informative.

Long-term phenological shifts and intra-specific differences in migratory change in the willow warbler

Every year, billions of birds move across the Earth to reach their wintering and breeding grounds. One of these mass movement members is the willow warbler, a long-distance migrant that winters in sub-Saharan Africa and breeds in northern Europe and Asia.

Changes in wintering bird populations in Finland

The numbers of wintering urban birds have increased three times and the number of water birds have increased ten times in Finland since the end of 1950s...

Prey size affects global distribution of the golden eagle

In this study we show that the availability of optimal-sized prey (between 0.5-5 kg) is a crucial driver of foraging behaviour, breeding success and distribution patterns of the Golden Eagle Aquila chrysaetos L. on a continental scale.

Spring phenology and timing of breeding in short-distance migrant birds

In this impressive long-term study the authors explore if common goldeneyes can track environmental cues and adjust their breeding in response to a changing climate. At their study site in Finland the ice-out date has advanced with 2 weeks during their 24 yr study...

Regional and seasonal flight speeds of soaring migrants and the role of weather

A big challenge for migration ecologists is to resolve how environmental conditions along the migration routes of birds affect their migration timing and individual fitness. Read the authors own story behind this recent Open Access paper...

Density-dependent effects on nesting success of temperate-breeding Canada geese

Canada geese nesting in suburban environments are often considered a nuisance. However, their demographic expansion and ease of study offer the opportunity to examine important ecological processes. In this study, the authors conclude that both negative...

Irruptive movements and breeding dispersal of snowy owls

Tracking snowy owls has been (and still is) a great challenge. The fact that those birds are highly mobile, that they show almost no breeding site fidelity and disperse over huge distances from one year to another yet increases the challenge. The use of satellite...


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