Southeastern American kestrel

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Southeastern American kestrel: Falco sparverius paulus

Taxonomic Classification

Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Falconiformes
Family: Falconidae
Genus/Species: Falcosparverius
Subspecies: Falco sparverius paulus
Common Name: Southeastern American kestrel

Listing Status

Federal Status: Not Listed
FL Status: State-designatedThreatened
FNAI Ranks: G5T4/S3 (Globally: Demonstrably Secure, Sub sp. Apparently Secure/State: Rare
IUCN Status: Not ranked

Physical Description

The Southeastern American kestrel is the smallest falcon found in the U.S.  This species of kestrel has a brownish back (dorsal) area with black flecking, a white belly (with males having less dark speckles on it), and black marks extending from the eyes downward.  The colors of their wings differ by gender, as males have bluish-gray wings while females have brown wings.  They also have a high pitched call during flight, which sounds like “klee-klee-klee” and “killy-killy-killy”.

Life History

During feeding, the Southeastern American kestrel will use a perch to locate and observe its prey, then fly in and catch the prey with its feet.  The diet of the Southeastern American kestrel primarily consists of grasshoppers and lizards, but they will also eat spiders and frogs. 

Breeding begins in March and concludes in June.  Females will lay three to five eggs on average in one breeding season.  Eggs are white and reddish-brown, with dark speckles.  Incubation takes one month and the chicks require another 30 days before they are capable of leaving the nest. 

The Southeastern American kestrel has a low life expectancy in the wild, only averaging 15 months.  The survival rate of its first year of life can be as low as 30%, while the rate increases to 50% after the first year.  Increased predation and collisions with motor vehicles are some of the reasons for the low survival rates for the subspecies.  Unlike the kestrels that breed in the rest of North America, the Southeastern American kestrel is a non-migratory subspecies.  It lives year-round in Florida and is fairly sedentary, with short dispersal distances.

Habitat and Distribution

Southeastern AmericanKestrel Distribution MapThe Southeastern American kestrel’s habitat in Florida includes open woodlands, sandhill, and fire maintained savannah pine habitats.  However, it will also use alternative habitats which include pastures and open fields located in residential areas.  Within these habitats, kestrels will nest in cavities excavated in large dead trees by woodpeckers.  Nest boxes are also used by kestrels, which have become an important artificial habitat for the kestrel due to the loss of primary habitats.  Any of the habitats used by kestrels must be able to support their nesting and ability to prey on potential food efficiently.  The Southeastern American kestrel can be found throughout Florida, while also being found remotely in the coastal plains of Louisiana, Georgia, and South Carolina. 

Threats:

The main threat to the Southeastern American kestrel is the loss of nesting and feeding habitat.  These habitats are destroyed during the development of new residential areas and farm lands, removal of trees in agriculture fields, and the alteration of fire-maintained pine habitats by suppressing fire.  Kestrels are also vulnerable to pollutants such as PCBs (polychlorinated biphenyls), DDT (dichlorodiphenyltrichloroethane), and heavy metals.  Other potential threats include increased predation, collisions with vehicles and aircraft, and the West Nile Virus (Bird 2009, Deem et al. 1998, Smallwood and Bird 2002).

Conservation and Management

The Southeastern American kestrel is protected by the U.S. Migratory Bird Treaty Act and as a State-designated Threatened species by Florida’s Endangered and Threatened Species Rule External Website.

Biological Status Review (BSR) Adobe PDF
Supplemental Information for the BSR Adobe PDF

Other Informative Links

Birds of North America External Website
Encyclopedia of Life External Website
FWC Research Institute
Florida Natural Areas Inventory External Website
The Cornell Lab of Ornithology External Website

 

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References

Bird, D.M.  2009.  The American kestrel:  from common to scarce?  Journal of Raptor Research 43:  261 – 262.

Deem, S.L., S.P. Terrell, and D.J. Forrester.  1998.  A retrospective study of morbidity and mortality of raptors in Florida:  1988 – 1994.  Journal of Zoo and Wildlife Medicine 29:  160 – 164.

Smallwood, J.A., and D.M. Bird.  2002.  American Kestrel (Falco sparverius).  The Birds of North America Online (A. Poole, Ed.).  Ithaca:  Cornell Lab of Ornithology;  Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/602/articles/introduction External Website.


Image Credit Photo by FWC



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