Species that sit at a feeder and eat, such as House Finch, American Goldfinch, and House Sparrow selected smaller seeds at equivalent rates to larger seeds, even if larger seeds had higher oil contents.
B) AMGO = American Goldfinch, BCCH = Black-capped Chickadee, HOFI = House Finch, HOSP = House Sparrow, TUTI = Tufted Titmouse, and WBNU = White-breasted Nuthatch.
Compared to Marler's results where subordinate females dyed to resemble males increased in dominance relative to males, our most analogous result occurred after altering subordinate male house finch coloration (covering red with blue) which increased their dominance relative to females.
We did not investigate age effects in our studies; however, to complete the understanding of the function of color in dominance relationships in the house finch, further studies need to be conducted that focus on responses of immature and adult brown-plumaged birds and their responses to plumage manipulations.
Moreover, male choice in a species like the house finch
is particularly difficult to measure because all females pair every year (Hill 1993b); thus, dichotomous comparisons between successful and unsuccessful individuals are not possible.
1 -- color) A tiny house finch
, trapped for blood testing, flies away upon release by a Vector Control District worker in Encino.
Our list included American crow, red shouldered hawk, red tail hawk, turkey vulture, California thrasher, California towhee, spotted towhee, oak titmouse, wrentit, bushtit, scrub jay, white crown sparrow, gold crown sparrow, lesser goldfinch, house finch
, rock dove, mourning dove, California quail, yellow-rump warbler, ruby crown kinglet and Anna's hummingbird.
The five most competent species were passerines: Blue Jay (Cyanocitta cristata), Common Grackle (Quiscalus quiscula), House Finch
(Carpodacus mexicanus), American Crow (Corvus brachyrhynchos), and House Sparrow (Passer domesticus).
The most commonly seen bird was the house finch
, with 1,586 reported, followed by doves and jays.
The species infected were a great blue heron (Ardea herodias), 2 American crows (Corvus brachyrhyncos), 2 American robins (Turdus migratorius), 2 mourning doves (Zenaida macroura), a red-tailed hawk (Buteo jamaicensis), a blue-gray gnatcatcher (Polioptila caerulea), a northern mockingbird (Mimus polyglottos), a house finch
(Carpodacus mexicanus), and a northern cardinal (Cardinalis cardinalis).
populations declined after the mycoplasma outbreak in the mid 1990s.
A rack of bird bands - tiny identifying bracelets - is within reach as the 88-year-old retired wildlife biologist examines a house finch
caught a few minutes earlier in one of his backyard traps.
Conjunctivitis in house finches
(Carpodacus mexicanus), caused by Mycoplasma gallisepticum (MG), was first reported in 1994 and has become endemic in house finch
populations throughout eastern North America.
The Thousand Oaks resident now can note when the house finch
population drops, as it did last year following aerial spraying for Mediterranean fruit flies over Camarillo.