Piedmont Wildlife Center - wild animal rehabilitation hospital based in Chapel Hill. Contact them if you've found a wild bird (or other animal) that needs help.
Redshank Software - home of Avendex, a database of over 30,000 bird sightings in North and South Carolina.
Eagle Optics - a leading supplier of optics for birders and butterfliers.
Hummingbirds.net - information on attracting, watching, feeding, and studying North American hummingbirds.
Optics for Birding - advice and resources for purchasing binoculars and spotting scopes.
Patuxent Bird Population Studies - includes the Identification InfoCenter, with photographs, songs, ID tips, maps, and life history information for North American birds.
Nelson Dobbs's Butterfly Page - Extensive photo gallery with images of butterflies from Georgia, Florida, South Texas, Mexico, and Thailand.
North American Butterfly Association (NABA) - the club for butterfliers in the US and Canada. Founded and run by Jeff Glassberg, author of the excellent series of butterfly field guides for North America.
Notes on the Butterflies of North Carolina - This online-only book by Harry LeGrand and Tom Howard has the most detailed information available on the butterflies of North Carolina. This site also has an online database of butterfly reports and count results.
Plant Conservation Alliance - a consortium of governmental and private agencies dedicated to restoring native habitat and preventing native plant extinction.
Plant Information Center - project to help students identify, find information about, and see pictures of NC trees and other plants.
B.W. Wells Association - named after a N.C. State plant ecologist, conducts naturalust trips to Rock Cliff Farm and other locations in the Raleigh area.
Duke Natural History Society - founded by Duke Biology grad students, this group specializes in slow-moving local trips that scrutinize every form of life.
Duke Lemur Center - has the world's largest collection of lemurs and other rare and endangered prosimians and other primates.
eNature - online field guides for amphibians, birds, butterflies, fishes, insects, mammals, native plants, reptiles, seashells, seashore creatures, spiders, trees, and wildflowers of North America.
NatureServe Explorer - authoritative conservation information on more than 50,000 plants, animals, and ecological communities of the United States and Canada.
NC Museum of Natural Sciences in Raleigh - good place to see dinosaurs. Houses a large bird collection, with a few on display. Also has a small butterfly room on the top floor.
NC Natural - extensive guide to North Carolina wildflowers, outdoor recreation, and entertainment.
NC Natural Heritage Program - inventories, catalogues, and supports conservation of the rarest and the most outstanding elements of the natural diversity of NC. What Harry LeGrand does for a living.
NC Wings - photos of North Carolina butterflies, dragonflies, and wildflowers by Ted and Linda Wilcox.
RLEPhoto - Randy Emmitt's photography site with extensive sections on North Carolina butterflies and dragonflies, plus some photos of birds, plants, and other organisms.
Most birders and butterfliers around here pick up ticks fairly often. The most common and dangerous tick-borne disease in NC is Rocky Mountain Spotted Fever, which can be fatal (up to 30% mortality if not treated; death occurs in as little as 8 days from onset of symptoms). Others, such as Lyme Disease (the most common nationwide, concentrated in the northeastern states), may become chronic if not treated early. See images at the Iowa State Entomology gallery and the URI Tick Research Laboratory.