Massachusetts Audubon Society.

The American Bird Conservacy, a newly-formed political advocacy group intended to mobilize birdwatchers as a constituency.

the American Birdwatching Association.

Janet Egan's Piping Plover Page. Includes a diary describing her recent years as a Warden at the Parker River Refuge, along with an extensive list of interesting and useful links.

A pageful of plover links from Dick & Jean Hoffmann.

The Plum Island Hawk Watch.
(Outdated)