Flickr: What plant is that? - worldwide ( I )
Flickr: Plant Family Recognition - worldwide ( I )
Missouri Botanical Garden: Tropicos - worldwide with focus on tropics
GardenWeb Galleries - worldwide
GardenWeb "Name That Plant" Forum - worldwide ( I )
USDA Plants - North America
USDA NRCS PLANTS Identification Keys - North America
E-Flora - British Columbia, Canada
University of British Columbia Garden Forums - North America ( I )
US National Arboretum - North America
Flickr: Califlora - California, USA ( I )
www.missouriplants.com/ - Missouri, USA
Field Museum Tropical Plant Guides - Central America & South America
Flora Iberica - Iberian Peninsula, Balearic Islands
BBC Plant Finder - UK?
Flickr: Flora of the British Isles: A Photographic Guide - UK ( I )
Flickr: the De Flora van Nederland (Flora of the Netherlands) - Netherlands
Flora von Österreich (Flora of Austria) Wiki - Austria
Botanik im Bild - Austria
Flora of Zimbabwe - Zimbabwe
Flora of Mozambique - Mozambique
Identifying Australian Rainforest Plants,Trees and Fungi - Australia

British Mosses and Liverworts - A Field Guide - UK
The Hidden Forest: Liverworts - New Zealand

The World of Mosses - Ontario, Canada
British Mosses and Liverworts - A Field Guide - UK
Identifying Australian Rainforest Plants,Trees and Fungi: Moss - Australia
The Hidden Forest: Mosses - New Zealand

Ferns of Arizona - Arizona, USA
Ontario Ferns - Ontario, Canada
Identifying Australian Rainforest Plants,Trees and Fungi: Ferns - Australia

World Wide Flowering Plant Family Identification - worldwide

Wildflowers

Flickr: Asteraceae - worldwide ( I )

Internet Orchid Species Photo Encyclopedia - worldwide
Flickr: Orchids - worldwide ( I )
Flickr: Orchids Identified - worldwide ( I )
Flickr: Wilde orchideeën van Nederland / Orchids of the Netherlands - Netherlands
Identifying Australian Rainforest Plants,Trees and Fungi: Orchids - Australia

LSU Interactive Identification Keys - North America, Central America, Europe
Ontario Grasses - Ontario, Canada

LSU Interactive Identification Keys - North America, Central America, Europe
Ontario Grasses - Ontario, Canada

Carex demonstrator key - worldwide
LSU Interactive Identification Keys - North America, Central America, Europe
Ontario Grasses - Ontario, Canada
Identifying Australian Rainforest Plants,Trees and Fungi: Sedges - Australia

The Eumycetozoan Project - wolrdwide
The Hidden Forest: Slime Moulds - New Zealand

Mushroom Observer - worldwide
Flickr: Funghi Fanatics - worldwide ( I )
Flickr: Shroom-Gloom - worldwide ( I )
Mykoweb - North America
MushroomExpert - North America
The Arizona Mycota Project - Arizona, USA
Hongos de Costa Rica - Costa Rica
Macrofungi of Costa Rica - Costa Rica
Australian Fungi Website - Australia
Identifying Australian Rainforest Plants,Trees and Fungi: Fungi - Australia
The Hidden Forest: Fungi - New Zealand

Lichens

Flickr: SPIDERS - worldwide ( I )
Flickr: The Spider Web - worldwide ( I )
Flickr: Field Guide to Insects and Spiders - worldwide ( I )
LinyGen: Linyphioid Genera of the World (Pimoidae and Linyphiidae) - worldwide
BugGuide - North America ( I )
Agriculture and Agri-Food Entomological Monographs - Canada/North America
North American Insects and Spiders - North America
European Spiders by Family - Europe
www.eurospiders.com/allspiders.htm - Europe
araneae –Spinnen Europas - Europe
Les Arachnides - Europe
Central European Spiders - Determination Key - Central Europe
Flickr: Spiders of the UK and Ireland - UK, Ireland ( I )
Spiders of North-West Europe - North-West Europe
Flickr: South African Spiders - South Africa ( I )
Flickr: Spiders of Australia - Australia ( I )
lifeunseen.com - Australia
The Find-a-spider Guide for the Spiders of Southern Queensland - Queensland, Australia
Brisbane Insects and Spiders Home Page - Queensland, Australia
Spiders of Townsville - Queensland, Australia
Flickr: Spiders from Singapore - Singapore ( I )
Common Spiders in Japan - Japan

Monograph of the Salticidae (Araneae) of the World - worldwide
Flickr: Salticidae - worldwide ( I )
Flickr: ►Jumping Spider - worldwide ( I )
Flickr: Jumping Spiders of Queensland - Queensland, Australia ( I )

Keys to the Families and Genera of Blood and Tissue Feeding Mites Associated with Albertan Birds - Alberta, Canada
Interactive HTML-based Dichotomous Key to Female Rhinonyssidae (Mesostigmata) from Birds in Canada - Canada

Photographic key to the Pseudoscorpions of Canada and the adjacent USA - Canada, USA

The Arachnid Order Solifugae - worldwide

Key to the Freshwater Malacostraca (Crustacea) of the Mid-Atlantic Region, pdf - North America, Mid-Atlantic USA
Benthic Macroinvertebrates in Our Waters - North America
Family-Level Key to Stream Invertebrates of Maryland and Surrounding Areas, pdf - North America, Mid-Atlantic USA

Flickr: Field Guide to Insects and Spiders - worldwide ( I )
Flickr: Insect Identification Help Group - worldwide ( I )
DrawWing: Analysis of Insect Wing Images - worldwide
Agriculture and Agri-Food Entomological Monographs - Canada/North America
BugGuide - North America ( I )
North American Insects and Spiders - North America
Insects of West Virginia - West Virginia, USA
Singing Insects of North America - North America ( I )
Benthic Macroinvertebrates in Our Waters - North America
Family-Level Key to Stream Invertebrates of Maryland and Surrounding Areas, pdf - North America, Mid-Atlantic USA
Aquatic Insects of Michigan - Michigan, USA
Digital Key to Aquatic Insects of North Dakota - North America, North Dakota, USA ( I )
Saskatchewan Aquatic "Bug" Guide - Saskatchewan, Canada
Natural History Museum Bug Forum - UK ( I )
Galerie-Insecte - France
Le Monde des insectes - France
Insektenbox - Germany
Flickr: Field Guide to Insects of Australia - Please identify this insect - Australia ( I )
lifeunseen.com - Australia
Brisbane Insects and Spiders Home Page - Queensland, Australia
Insects of Townsville - Queensland, Australia

Heptageniidae of the World: Part II - worldwide
Digital Key to Aquatic Insects of North Dakota - North America, North Dakota, USA ( I )
Saskatchewan Aquatic "Bug" Guide - Saskatchewan, Canada

Beetle Gallery - Central Europe
Southeast Asian beetles - Southeast Asia
Salagubang - Your Online Resource on Philippine Beetles - Philippines
Käfer Europas - Europe
Galerie der Käfer - Central Europe
www.kerbtier.de - Germany

Carabidae of the World - worldwide
Ground Beetles of Ireland - Ireland

Longhorn Beetles (Cerambycidae) of the West Palearctic Region - Europe

Stippen.nl gaat over lieveheersbeestjes - Netherlands ( I )
Ladybirds of Australia - Australia

Generic Guide to New World Scarab Beetles - North America, Central America, South America, Carribean

www.diptera.info/ - worldwide ( I )
Anatomical Atlas of Flies/ - worldwide
Agriculture and Agri-Food Entomological Monographs: Download Manual of Nearctic Diptera! - North America
Catalogue of the Craneflies of the World - worldwide
Photographic Key to the Adult Female Mosquitoes (Diptera: Culicidae) of Canada - Canada
Tabanidae of Canada, east of the Rocky Mountains 1: a photographic key to the species of Chrysopsinae and Pangoniinae (Diptera: Tabanidae) - Eastern Canada
The Bee Flies (Diptera: Bombyliidae) of Ontario, with a Key to the Species of Eastern Canada - Ontario, Eastern Canada

Colour key to species for female bumblebees - worldwide
Antweb - worldwide
Pacific Invasive Ant Key - Pacific Island Region
Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region - Eastern North America
Key to Bee Families of the World - worldwide
Discover Life Apoidea Guides - North America
The Bee Genera of Eastern Canada - Eastern Canada
Wildbienen - Germany
Bombus - Germany
British bumblebee identification guide - UK
Paul D. Hurd: The Carpenter Bees of California (pdf) - Southwest US

learn about butterflies - worldwide
Butterflies of America - North and Central America
Butterflies and Moths of North America - North America
Flickr: Field Guide: Butterflies & Moths of North America - North America ( I )
North American Moth Photographers Group - North America
Images of North American Moth Species - North America
Neotropical Butterflies - South America, Cental America, Southern North America
The Field Museum Rapid Color Guides: Amazonia Butterflies - Amazonia, South America
Art Shapiro's Butterfly Site - Central California, USA
The Lepidoptera of Southeastern Arizona - Arizona, USA
Caterpillars and Parasitoids of the Eastern Andes in Ecuador - Ecuador
Moths and Butterflies of Europe and North Africa - Europe and North Africa
Lepiforum - Central Europe ( I )
UKmoths - UK
UK Butterflies - UK ( I )
Schmetterling-Raupe - Germany
Vlindernet - Netherlands
Flickr: Fieldguide to the Butterflies of Africa - butterfly ID please - Africa ( I )
Afromoths, online database of Afrotropical moth species (Lepidoptera) - Africa
Butterflies of Singapore - Signapore & Far East ( I )
Hong Kong Lepidopterist's Society: Hong Kong Butterflies - Hong Kong
Moths of Borneo - Borneo Butterflies of Australia - Australia

Flickr: Sphingidae of the World - worldwide ( I )

Mecoptera of Ontario - Ontario, Canada

Caddisfly Families - North America
Digital Key to Aquatic Insects of North Dakota - North America, North Dakota, USA ( I )
Saskatchewan Aquatic "Bug" Guide - Saskatchewan, Canada

European Bugs/Galerie der Wanzen - Europe
British Bugs - UK
Flickr: Heteroptera from the Iberian Peninsula - Spain, Portugal ( I )
Danmarks Blomstertæger (Miridae) - Denmark

OdonataCentral - worldwide
Flickr: Dragonflies around the World - worldwide ( I )
America Dragonfly - North America, Central America, South America
Neotropic Dragonfly - Central America, South America
British Dragonfly Society: Checklist of UK Species - UK
Africa Dragonfly - Africa
Asia Dragonfly - Asia
Dragonflies of India-A Field Guide (pdf, older version) - India

Sea Slug Forum - worldwide ( I )
Nudi Pixel: A web-based identification tool for nudibranchs - worldwide
Benthic Macroinvertebrates in Our Waters - North America
Family-Level Key to Stream Invertebrates of Maryland and Surrounding Areas, pdf - North America, Mid-Atlantic USA

Appalachian Guide to Amphibians and Reptiles - Appalachia, USA
Reptiles and Amphibians of Arizona - Arizona, USA
Herps of Panama - Panama
Caribherp - West Indies
The Field Museum Rapid Color Guides: Central Amazonia: Anfibios y Reptiles - Central Amazonia, South America
HERPWATCH Philippines - Philippines
Amphibians and Reptiles of Europe - Europe
Amphibien und Reptilien Österreichs - Austria
Reptiles et Amphibiens de France - France
AmphibiaWeb - worldwide
Flickr: Salamanders & Caecilians - worldwide ( I )
Checklist of Amphibian Species and Identification Guide - North America
Tadpoles of the United States and Canada: A Tutorial and Key - North America
The Field Museum Rapid Color Guides: Amazonia--Frogs & Toads - Amazonia, South America

Flickr: Bird Identification Help Group - worldwide ( I )
Flickr: Field Guide: Birds of the World - Bird ID Help Line - worldwide ( I )
BirdForum: Bird Identification Q&A - worldwide ( I )
The Internet Bird Collection - worldwide
Avibase - worldwide
xeno-canto (birdsound) - worldwide (several sites for different contents)
Printable Bird Checklists - worldwide
All About Birds - North America
Flickr: Birdshare - North America ( I )
www.whatbird.com/ - North America ( I )
Flickr: North American Birds: Field Guide - Bird Identification Help - North America ( I )
Bird Web - Washington State, USA
Bird Identifications (The Nutty Birdwatcher) - Eastern US
10,000 Birds - mostly North America
American Birding Association Image Gallery - mostly North America
www.antpitta.com/index.htm - South America, Central America
The Field Museum Rapid Color Guides: Antbirds of Peru and Bolivia - Peru and Bolivia
Wiki Aves, English version - Brazil ( I )
RSPB Bird Identifier - UK ( I )
Flickr: Birds and Wildlife UK - Bird and Wildlife ~ IDENTIFICATION - UK ( I )
Flickr: Birds of Southern Africa - The bird identification topic - Southern Africa ( I )
Birding-Aus - Australia
Birding Australia Mailing List Archives - Australia
Australasian Bird Image Database - Papua New Guinea, Australia, New Zealand, Norfolk Island, the Solomon Islands, New Caledonia and Vanuatu ( I )
New Zealand Birds - New Zealand
www.birdwatch.ph - Philippines

FishBase - worldwide
FishBase World Fish Self-Help ID Key - worldwide
Flickr: Fish ID - worldwide ( I )
Flickr: Fish species / FishBase - worldwide ( I )

Appalachian Guide to Amphibians and Reptiles - Appalachia, USA
Reptiles and Amphibians of Arizona - Arizona, USA
The Reptiles of British Columbia - British Columbia, Canada
Herps of Panama - Panama
Caribherp - West Indies
The Field Museum Rapid Color Guides: Central Amazonia: Anfibios y Reptiles - Central Amazonia, South America
HERPWATCH Philippines - Philippines
Amphibians and Reptiles of Europe - Europe
Amphibien und Reptilien Österreichs - Austria
Reptiles et Amphibiens de France - France

Snakes of North America - North America
Florida Snakes Identification - Florida

North American Mammals - North America
An Identification Manual to the Small Mammals of British Columbia - British Columbia, Canada
Field Guide: Mammals of British Columbia - British Columbia, Canada
Mammals of Tanzania - Tanzania
Australian Mammal Finder - Australia