Integrated Taxonomic Information system (ITIS)
Global Biodiversity Information Facility (GBIF)
ARKive - multimedia guide to the world's endangered species
World Register of Marine Species (WoRMS)
Agnatha [Cyclostomata (Myxini, Petromyzonti), †Condonta, †Ostracodermi],
Gnathostomata [Chondrichthyes (Elasmobranchii, Holocephali), Actinopterygii, Sarcopterygii (Coelacanthi, Dipneusti)]
Associação Portuguesa de Herpetologia
Sociedade Brasileira de Herpetologia
South American Journal of Herpetology
Amphibian Species of the World - American Musuem of Natural History
AmphibiaWeb - University of California, Berkeley
The Reptile Database Uetz, P. & Jirí Hošek (eds.)
Birgit und Peter Oefinger trip reports and photo documentation of the European reptile species (including the Canary Islands, Madeira and all Aegean Islands)
Clements / eBird (Cornell Laboratory of Ornithology)
The Howard and Moore Complete Checklist of the Birds of the World
Handbook of the Birds of the World / BirdLife International
Gill & Donsker / IOC World Bird List
Avibase - Bird Studies Canada
Taxonomy in Flux - sobre as novas ideias que podem dar lugar a alterações nas listas de aves, John H. Boyd III
Mammal Diversity - American Society of Mammalogists
Mammal watching - Jon Hall
Wilson & Reeder's Mammal Species of the World - Bucknell University
Mammals - National Museum of Natural History, Division of Mammals
Journal of Mammalogy - American Society of Mammalogists
Mammals: Families and Subfamilies of the World - Don Robertson
Livro vermelho dos mamíferos de Portugal Continental
Edentata - Conservation International
Neotropical Primates - Conservation International
Primate Conservation - Conservation International
Large Carnivore Initiative for Europe IUCN/SSC Specialist Group
Le loup en France Office National de la Chasse et de la Faune Sauvage
Institut pour la Promotion et la Recherche sur les Animaux de protection (IPRA)
Mission Loup DREAL Auvergne-Rhône-Alpes
Homme et loup, 2000 ans d'histoire
A Grammatical Dictionary of Botanical Latin Missouri Botanical Garden
Les noms vernaculaires des plantes
Flora-On Sociedade Portuguesa de Botânica
Dias com árvores Paulo V. Araújo e Maria P. Carvalho