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American Kestrel

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Nesting Information:

The Open Space Division has partnered with the Colorado Avian Research and Rehabilitation Institute (CARRI) to install outdoor web cameras on select Open Space properties to view nesting activities of local raptors in 2020.  An American Kestrel box with a live-camera was installed in 2019 and a pair of kestrels have been visiting the box every day and we anticipate the female will lay eggs soon. Activity is currently observed mostly in the mornings and early evenings.  The City of Louisville is excited to provide an opportunity for viewers to watch incubation, egg hatching, and feeding activities of American Kestrels during the breeding season.  Below is some information on American Kestrels: 

  • American Kestrels are common year-round residents of Boulder County and can be found throughout most of North America.
  • They are the smallest and most widespread falcons in North America and can be found in most open habitats with adequate cavities for nesting and perches for hunting.
  • The species has been in decline due to loss of habitat, disease, and predation by larger owls and hawks.
  • Unlike most raptors, the American Kestrel exhibits sexually bimorphic plumage, meaning they exhibit different characteristics.  The males are more colorful than the females and have bluish grey wings; females have reddish-brown wings with black barring.
  • Kestrels prey on insects, small rodents, reptiles, amphibians, and small birds.
  • Nesting Dates and Clutch Facts:
    • Courtship: March to April
    • Incubation: April to mid-June for 26-31 days; 3-6 eggs
    • Fledging Period:  Late April to mid-June for 26-31 days; average is 30 days.  80% is 24 days. Female cares for the young.

The City of Louisville would like to give thanks to:

The Colorado Avian Research and Rehabilitation Institute (www.carriep.org )

2020 Clips: 

May 26, 2020 May 22, 2020
April 26, 2020 April 24, 2020
April 22, 2020 April 15, 2020
April 13, 2020 April 12, 2020
March 13, 2020 March 27, 2020