Hawk Index page.


Hawk Index page.

Last up dated on; 03/28/09

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Nest Sanitation
The very fragility of nests may be adaptive in forcing many birds to build a new nest every year; nests that do not deteriorate over the winter can harbor potentially lethal numbers of parasites or pathogens that may withstand the cold and await returning nesters. Indeed, despite their appearance as peaceful retreats, nests are often alive with invertebrates feeding on the birds, on the birds' waste products, or on each other. Infestations of parasites (fly maggots, fleas, ticks, and mites) or pathogens (bacteria and fungi) are discouraged by various means. One that is widely used is, of course, removal of the fecal sacs of the young.

Recent work has shown that many birds repeatedly add green leaves or cedar bark with pesticidal properties to their nests. This behavior has been recorded in numerous birds of prey that often reuse old nests (some kites, many hawks, and most eagles) and in some passerines (especially secondary cavity nesters, such as European Starlings and Purple Martins). Interestingly, nuthatches, which are also secondary cavity nesters, ritually smear pine pitch and rub insects around the entrance of their holes instead of adding fresh greenery. Both the pitch and the defensive chemicals of the insects may discourage parasites.

Many birds avoid reusing old nests, even if the nests do not deteriorate over the winter. When heavy parasite infestations do occur, nestling mortality rises, nests may be deserted, and in extreme cases, entire colonies have been known to move to a new location.

Copyright ® 1988 by Paul R. Ehrlich, David S. Dobkin, and Darryl Wheye.

the above taken from: http://www.stanfordalumni.org/birdsite/text/essays/Nest_Sanitation.html


Please tell me what this is.


What do you mean it's a Gray Hawk??? new photos as of 05/15/03

More new images of the Coopers as of 12/21/05



Harlan's Red-tailed03/28/09

**Harris' Animations on this one.

Harris' eating breakfast on my swamp cooler one morning.

Northern Gashawk

Northern Harrier

**Red-tailed Animations on this one.

This is a link to a Leucistic Red Tail Hawk @ http://azfo.org/gallery/red_tailed_hawk_leucistic.html


Zone-tailed 08/14/05 at the Grand Canyon South rim - 08/20/05 more images

Broad-winged Hawk http://www.azfo.org/ArizonaBirdCommittee/broad-wingedhawk.html

Northern Goshawk http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Northern_Goshawk.html

White-browed Hawk http://wingsbirds.com/tours/view/193

Broad-winged Hawk http://www.azfo.org/ArizonaBirdCommittee/broad-wingedhawk.html

Short-tailed Hawk http://www.azfo.org/ArizonaBirdCommittee/short-tailedhawk.html

Red-shouldered Hawk http://www.azfo.org/ArizonaBirdCommittee/red-shoulderedha.html

Broad-winged Hawk http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Broad-winged_Hawk.html

Rough-legged Hawk http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Rough-legged_Hawk.html

White-browed Hawk http://wingsbirds.com/tours/view/193



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