Online wildlife identification guides
Bug Guide - A searchable guide to North American insects and spiders with great images.
Flora of the Washington-Baltimore Area - A searchable database of the flora of Washington DC brought to you by the DC herbarium.
Maryland Native Plant Society - A membership-based organization to promote awareness, appreciation, and conservation of Maryland's native plants and their habitats.
Online Bird Guide - Unbeatable online guide to America's birds. A project of the Cornell lab of Ornithology and the Audubon Society.
Virginia Native Plant Society - A membership-based organization to further appreciation and conservation of Virginia's native plants and habitats.
Virginia Herpetological Society - A membership-based organization to further appreciation and conservation of Virginia's native reptiles and amphibians. Excellent photo guide to herps.
What Tree is That? - An online Dichotomous key to trees of the Eastern United States
Washington DC Biodiversity Database - A useful, searchable database from Georgetown University Laboratory of Entomology and Biodiversity. Still being built out, but good for invertebrates.
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