Every year, many wild animals undertake long-distance migration to breed in the north,
taking advantage of seasonally high pulses in food supply, fewer parasites, and lower …

Reduced food availability is implicated in declines in avian aerial insectivores, but the effect
of nutritional stress on mammalian aerial insectivores is unclear. Unlike birds, insectivorous …

Advancements in phenology and changes in morphology, including body size reductions,
are among the most commonly described responses to globally warming temperatures …

Evolutionary theories of seasonal migration generally assume that the costs of longer
migrations are balanced by benefits at the non‐breeding destinations. We tested, and …

Increasing predation danger can select for safety‐enhancing modifications to prey
morphology. Here, we document the multi‐decade wing lengthening of a Pacific flyway …

Long-distance migrants are assumed to be more time-limited during the pre-breeding
season compared to the post-breeding season. Although breeding-related time constraints …

The 40 or so species of beach-loving plovers (genus Charadrius) comprise a diverse group
of shorebirds found around the world. Most of these species are challenged by changing …

Peregrine falcons (Falco peregrinus) have undergone a steady hemisphere-wide recovery
since the ban on DDT in 1973, resulting in an ongoing increase in the level of danger posed …

A recent study demonstrated that semipalmated sandpiper (Calidris pusilla) wing lengths
have shortened from the 1980s to the present-day. We examined alternative and untested …

Abstract Background The western sandpiper (Calidris mauri) is an early southbound migrant
species in North America. The 'peregrine avoidance'hypothesis proposes that this timing …