Territoriality Article describing how birds try to exclude others of the same species from their home range. http://www.stanford.edu/group/stanfordbirds/text/essays/Territoriality.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Vocal Dialects Article describing how the songs of many avian species show geographic variation. http://www.stanford.edu/group/stanfordbirds/text/essays/Vocal_Dialects.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Vocal Copying Article describing how birds learn their songs from adult tutors and may incorporate sounds from other species into their repertoire. http://www.stanford.edu/group/stanfordbirds/text/essays/Vocal_Copying.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Vocal Functions Songs identify the species of the singing bird. The territorial song of males serves the dual purpose of territorial proclamation directed at other males and of mate attraction directed toward females. http://www.stanford.edu/group/stanfordbirds/text/essays/Vocal_Functions.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Sexual Selection Female birds of some species tend to choose as mates those males holding the most desirable territories, but there is little evidence that females preferentially select males with different degrees of ornamentation. http://www.stanford.edu/group/stanfordbirds/text/essays/Sexual_Selection.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Polygyny Most birds are monogamous, but in some species the occurrence of polygyny, where one male mates with more than one female, is related to high-quality territories with an abundance of resources. http://www.stanford.edu/group/stanfordbirds/text/essays/Polygyny.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Parental Care The young of passerines when first hatched are naked, blind, and helpless and require much care which involves feeding, training and protection from predators. http://www.stanford.edu/group/stanfordbirds/text/essays/Parental_Care.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Creches Article describing how some birds adopt the strategy of grouping their young, leaving them with a guardian while both parents go off to forage. http://www.stanford.edu/group/stanfordbirds/text/essays/Creches.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Incubation: Heating the Egg Most birds create the required temperature by sitting on their eggs but some transfer heat through their webbed feet, and the megapodes of Australia bury them in a mound of decaying vegetation. http://www.stanford.edu/group/stanfordbirds/text/essays/Incubation.html Stanford.edu~Site InfoWhoisTrace RouteRBL Check
