We examined population trends and status in 37 taxa of Canadian raptors using Breeding
Bird Survey (BBS) data (1966–1994 and 1985–1994) for the whole of Canada and seven …

Hole nesting birds, due to the long lasting nature of cavities, use their nest sites for many
years. Therefore, they may face the problem of the presence of nest material from previous …

The annual migrations of birds are impressive phenomena that raise interesting
physiological, evolutionary, and ecological questions. One facet of migration that has long …

Three main benefits are thought to underlie communal roosting in birds: a reduction in
thermoregulation demands, a decrease in predation risk, and an increase in foraging …

Biological synanthropy refers to human-mediated symbioses. Synanthropic birds are thus
avian symbionts of humans. Such birds have a wide degree of relationship to humans …

Paternity has been hypothesized to be related to the evolution of paternal care because (1)
there should be selection for males not to invest in broods with an uncertain parentage, or …

Annual bird mortality in the United States from anthropogenic sources is estimated at one
billion. Urban raptors are affected by many of these factors; however, little is known about …

Contrary to what is observed in Fennoscandia, it seems to be widely accepted that small
mammals do not exhibit multi‐annual population cycles in the boreal forest of North …

Rear-edge populations of montane species are known to be vulnerable to environmental
change, which could affect them by habitat reduction and isolation. Habitat requirements of …

Loss and alteration of habitats by human actions are the largest worldwide hazard to
biodiversity and viability of populations. In boreal forests of Eurasia and North America the …