v.13 (1970) - Check-list of birds of the world - Biodiversity Heritage Library

The Biodiversity Heritage Library works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community.

What is biodiversity and why does it matter to us?, Biodiversity

Elk - Yellowstone National Park (U.S. National Park Service)

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Environmental Justice – The Field

Singapore's herpetofauna: updated and annotated checklist, history, conservation, and distribution

Global problems related to biodiversity science, especially the effects of invasive species

Birds of Iran - An annotated checklist of the species and subspecies

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Checklist of bird species recorded during the study.

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Orion Magazine - World Gone Mad

State of the world's birds 2013 by BirdLife International - Issuu