Many birds reduce rest-phase energy demands through heterothermy, physiological
responses involving facultative, reversible reductions in metabolic rate and body …

Hummingbirds share biologically distinctive traits: sustained hovering flight, the smallest bird
body size, and high metabolic rates fueled partially by nectar feeding that provides …

Torpor is an incredibly efficient energy-saving strategy that many endothermic birds and
mammals use to save energy by lowering their metabolic rates, heart rates, and typically …

Birds are endotherms and maintain their body temperatures with heat produced by cell
metabolism. The energy consumed at rest, or the basal metabolic rate (BMR), varies within …

For many biologists, the intertidal zone is a captivating place. At low tide, seawater collects
in depressions and crevasses along rocky shorelines, leaving behind tidepools teeming with …

With few exceptions, birds lay their eggs in nests and the young of many species spend
variable amounts of time in nests before fledging. After discussing the evolution of nests, the …