Reports

James F. Byrnes High School

Bewick's Wren

Phylum: Chordata 

Class: Aves 
Order: Passeriformes 
Family: Troglodytidae 
Genus: Thryomanes 
Species: Thryomanes bewickii

Description: A 13-centimeter-long bird with a long sideways-flitting tail edged with white spots, a long white eyebrow, a slender decurved bill, and a pale unmarked throat and breast;
On the verge of extirpation in the eastern U.S., it has no remaining population strongholds in this region. Mainly considered to be threatened.

Threats: threats are poorly defined, but eastern populations are clearly threatened, and possibly western populations as well. Declines may be due to interspecific competition, habitat changes, inclement weather, and predators. 

Habitat: Uses brushy areas, thickets and scrub in open country, open and riparian woodland, and chaparral. More commonly in arid regions but locally also in humid areas (subtropical and temperate zones) including country towns and farms. Lives in deciduous forests.

Reproduction: Lay eggs from April into June, with from four to nine eggs per clutch. Generally, two or three broods are raised per year. The female incubates and the chicks hatch after approximately 14 days. Juveniles fledge approximately 14 days after hatching. Both parents feed until young are 28 days old. 

Threats: Declines may be due to interspecific competition, habitat changes, inclement weather, and predators. 

Protection: Populations east of the Mississippi require intervention to prevent complete extirpation. It would be appropriate and helpful to list species as Threatened or Endangered in all states east of the Mississippi with present or recent breeding populations.

Restoration of population: Until the causes of decline are found, recovery is unlikely. Release into formerly occupied habitat is not likely to succeed until reasons for the decline are found and the possibility of controlling threats is explored. 

Food Habits: The wrens most preferred source of food is the beetle followed by any small larva. Bewick's wrens are mostly neutral in relation to other vertebrate animals in their habitat. They may face predation by bird-hawks or owls to a slight extent. Nest predation by snake and cat were reported
.

Dutch

Written by: Stephen
Stephen Rominger 
Environmental Science
2nd Period 
Ferrell - Dec. 8, 2000

(geschreven door)

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