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Species Explorer Details for Swainson's hawk


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Names

Scientific Name: Buteo swainsoni
Common Name: Swainson's hawk
Taxon Subgroup:
Alternate Names:
Additional Common Names:

Status

Native to California: True
Uncommon in California:
Status: Federal Listed: None, State Listed: Threatened, Global Rank: G5, State Rank: S2, ABC: Watch List of Birds of Conservation Concern, IUCN: Least Concern, USFS: Sensitive, USFWS: Birds of Conservation Concern

Classification

Category: Bird
Class: Aves
Order: Falconiformes
Family: Accipitridae
Hybrid Name:
Genus: Buteo
Species: swainsoni
Sub Species:
Variety:
Additional Classification
(Undescribed):

Reference Keys

DFG TaxonID: 867
Other Identifying Codes: AOU (SWHA) , TSN (175367) , CNDDB (ABNKC19070) , TNS-Global (105571) , CWHR (B121)

Source Information

Author
(Infra Species):
Author: Bonaparte, 1838
Taxon Name Source: DFG California Natural Diversity Database
Data Source: DFG California Natural Diversity Database
Date Added: 2/10/1982
Date Updated: 2/26/2008
Updated by: sys
Review Status: Active

Documents

 
 
Possibly Related Documents
item Five-year status review: Swainson's hawk (Buteo swainsoni)
The Department recommends that the Swainson's hawk retain Threatened status. Loss of nesting and foraging habitat due to agricultural and urban expansion has greatly reduced the breeding range and abundance of the Swainson's Hawk in California. Bloom (1980) estimated a 90% decline in the breeding population between 1900 and 1979. Approximately 80% of the total state-wide population of 550 pairs is currently found in the Central Valley where agricultural conversion has replaced virtually all native grassland foraging habitat (Estep 1989). Agricultural cropping patterns directly influence the distribution and abundance of the Swainson's Rawk in the Central Valley (Estep 1989). This dependence on agriculture poses a continuing threat to a large percentage of the remaining population based on current trends toward cultivation of incompatible (with Swainson's Hawk habitat requirements)crop-types. Agricultural conversion, reduced prey populations, possibly due to a combination of drought conditions and overgrazing, and loss of historic sage-steppe/grassland foraging habitat may be factors in a continuing decline of Swainson's Hawks in portions of the Great Basin region of the state. Urban development also continues to reduce Swainson's Hawk nesting and foraging habitat in the Central Valley.

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