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Second Atlas of Breeding Birds in Pennsylvania: A Review by an Atlas Novice

10,000 Birds

A breeding bird atlas is a special kind of book. For birders, it’s the extremely large book, shelved in a place where it can’t crush the field guides, used to research the history of a bird in their area. So, what exactly does a breeding bird atlas contain? The resulting book, 616 pages in length, 6.4

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Calliope and Anna’s Male Hummingbirds at the Feeder

10,000 Birds

The Calliope Hummingbird is the smallest North American breeding bird 1. The males arrive on breeding grounds before the females and, according to their range map, they probably breed here in Shasta County. I haven’t seen a female yet this year either but here is a photo of one I took back in April of 2010.

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Searching for the Elusive and Less-Colorful: The Sinaloa Martin

10,000 Birds

The non-breeding distribution is virtually unknown, although they are suspected to winter in northern South America (Howell and Web 1995). Until recently the vocalizations of Sinaloa Martin were unknown and known breeding sites are few and far between. Very little is known about this enigmatic species.

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Endangered and Unknown: Pale-headed Brush-Finch

10,000 Birds

Currently endemic to a single valley system in the Andes of Ecuador, this species escaped detection from researchers for thirty years until the rediscovery of a few pairs in November 1998 by Dr. Neils Krabbe. In November 2010, I backpacked for fifty days via the reasonably good bus system in Ecuador.

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An unusual auk baby

10,000 Birds

Others, like the petrels and some of the auks, will lay a single egg per breeding attempt. The investment placed in each clutch bur seabirds is so great that only one breeding attempt can be seen to completion each year. They are cavity nesters, breeding in natural cavities or holes dug into the soil. So why do it?

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Mitochondrial mysteries and splitting-lumping Yellow-rumped Warblers

10,000 Birds

The photo above is a breeding-plumaged Myrtle Warbler by Kelly Colgan Azar. The AOU lumped everything into “Yellow-rumped Warbler” ( Dendroica coronata ) in 1973 and most recently reconsidered the complex in 2010 (see Proposal 2010-A-4 ) but voted 7-4 to maintain the status quo.

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Why Do Penguins Wear Tuxedos?

10,000 Birds

Penguins are flightless, but some species locomote over long distances on antarctic ice to travel between breeding grounds and the sea. One part of this question can be answered with some very interesting recent research. They have special adaptations to stay warm and to keep their eggs and chicks warm. Salas-Gismondi, R., Vinther, J.,

Penguins 251