The ecology of blackbird (Agelaius
) social systems.
icterocephalus "tordo cabeza amarilla", es comun, conforma grupos familiares de hasta ocho individuos, entre adultos, juveniles y pichones, en los gramadales y algunos arbustos, habiendose establecido de manera exitosa; sin embargo en los ultimos anos sus registros son escasos.
1977: Harem size, territory quality and reproductive success in the red-winged blackbird (Agelaius
By June post-burn, as the mean vegetation height approached 140 cm, the dominant species once again were red-winged blackbirds (Agelaius
phoeniceus), common yellowthroats (Geothlypis trichas) and swamp sparrows (Melospiza georgiana).
Antropogenic noise affects song structure in redwinged blackbirds (Agelaius
of detections All birds 210 American goldfinch Carduelis tristis 6 American robin Turdus migratorius 1 American tree sparrow Spizella arborea 30 Bewick's wren Thryomanes bewickii 2 Dark-eyed junco Junco hyemalis 1 Eastern meadowlark Sturnella magna 5 European starling Sturnus vulgaris 1 Field sparrow Spizella pusilla 6 Harris's sparrow Zonotrichia querula 4 Horned lark Eremophila alpestris 11 Lapland longspur Calcarius lapponicus 1 Loggerhead shrike Lanius ludovicianus 5 McCown's longspur Calcarius mccownii 1 Northern cardinal Cardinalis cardinalis 2 Rufous-crowned sparrow Aimophila ruficeps 5 Red-winged blackbird Agelaius
phoeniceus 9 Song sparrow Melospiza melodia 6 Spotted towhee Pipilo maculatus 1 Unknown spp.
wordpress.com/tag/species-of-special-concern/ (last visited June 6, 2016); California Department of Fish and Wildlife, Evaluation of the Petition From The Center For Biological Diversity to List Tricolored Blackbird (Agelaius
tricolor) As Endangered Under the California Endangered Species Act (March 2015), http://www.fgc.ca.gov/meetings/2015 /Apr/Exhibits/33_1_TRBL_petition_evaluation.pdf) (last visited June 6, 2016).
Although they are different originally there are creatures that appear differently even though they are similar genetically on the contrary the creatures that appear similar Consequently some bird species that have different appearances of cock and hen (for instance, Agelaius
phoenicus) have been defined as different species by misunderstanding their physical appearances (2).
(25-30) Differing from studies on Norway rats (Rattus norvegicus) (31) or redwinged blackbirds (Agelaius