A global Partnership of conservation organisations that strives to conserve birds, their habitats and global biodiversity, working with people towards sustainability in the use of natural resources.
The IUCN Red List of Threatened Species™
Their goal is to provide information and analyses on the status, trends and threats to species in order to inform and catalyse action for biodiversity conservation. It is widely recognized as the most comprehensive, objective global approach for evaluating the conservation status of plant and animal species.
ARKive is a ‘virtual’ conservation effort. "Using film, photographs and audio recordings, ARKive is creating a unique record of the world’s biodiversity - complementing other species information datasets, and making a key resource available for scientists, conservationists, educators and the general public."
ITIS Integrated Taxonomic Information System
Provides authoritative taxonomic information on plants, animals, fungi, and microbes of the world... to create an easily accessible database with reliable information on species names and their hierarchical classification.
Species 2000 & ITIS Catalogue of Life
Species 2000 and ITIS decided to work together to create the Catalogue of Life... to become a comprehensive catalogue of all known species of organisms on Earth. Rapid progress has been made and this Catalogue of Life edition contains 1,315,754 species... Probably just slightly over 2/3 of the world's known species.