Stanford.edu has 1,431 URLs listed in 1,077 Dmoz categories.
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 Top/Science/Biology/Zoology/Chordates/Ornithology
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 Top/Science/Biology/Zoology/Chordates/Ornithology
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 Top/Science/Biology/Zoology/Chordates/Ornithology
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 Top/Science/Biology/Zoology/Chordates/Ornithology
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 Top/Science/Biology/Zoology/Chordates/Ornithology
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 Top/Science/Biology/Zoology/Chordates/Ornithology
Urban Birds Article discussing how birds have adapted to urban foraging amid the artificial concrete and steel ecosystems of cities. http://www.stanford.edu/group/stanfordbirds/text/essays/Urban_Birds.html Top/Science/Biology/Zoology/Chordates/Ornithology
