Butterflies of Ecuador: Past and current research on Ecuadorian butterflies.
Butterflies of the Lake Baikal Region: Photographs of specimens. Most content in Russian.
Butterfly Conservation Initiative: Dedicated to the conservation of threatened, endangered, and vulnerable North American butterflies and the habitats that sustain them, with a focus on recovery, research, and education.
Jamides: Articles about the Lycaenidae of southeast Asia, list of Japanese butterflies, and information about Japanese insect associations.
Linneaus' Butterfly Type Specimens: Images of the type specimens of dozens of species. From the Natural History Museum, London.
The butterflies of lovely Japan: Photo gallery, news.
The Butterfly Conservatory: Past exhibit at the American Museum of Natural History: photographs, webcams, virtual tour.