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Peter LaTourrette
Peter LaTourrette began photographing wild birds a long time ago. Although he has taken his pursuit worldwide, much of his work has been in the Bay Area, especially Jasper Ridge Biological Preserve. His asessment of local photographic opportunities is succinct: "We are blessed with a fantastic diversity of habitats and species within a very short distance of Stanford." The Los Altos-based photographer can be reached via http://www.birdphotography.com
If you get a good look at adult Violet-green and Tree Swallows, they are easily differentiated. In the Violet-green, the white on the cheek extends above the eye and the white flank patches extend to the sides of the rump in contrast to the Tree Swallow which shares neither of these characteristics.
In juveniles these marks are not easily seen, making identification more difficult. One can often identify juveniles by noting the adults from which they seek food.
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Violet-green Swallow
Photograph
Fujichrome Velvia
Nikon 500mm f4 P with 1.4x teleconverter,
making it effectively a 700mm f5.6.
Peter LaTourrette
1989 |
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Stanford Note: Although photographed at the Jasper Ridge Biological Preserve, these birds are readily seen at the Dish and at Lake Lagunita. In flight, Tree Swallow climb with several rapid wing beats and periodic glides while the smaller Violet-green glides less and flaps more quickly. |
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While tending nestlings, these aerial foragers make about 350 feeding visits for a brood of five, bringing up to 8,000 insects. For additional photographs of Jasper Ridge birds see: http://www.stanford.edu/~petelat1/birdlist.html#jasper |
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Tree Swallow
Photograph
Fujichrome Velvia Nikon 500mm f4 P with 1.4x teleconverter,
making it effectively a 700mm f5.6.
Peter LaTourrette
1994 |
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