Birds of the World is a powerful research database that brings together deep, scholarly content from four celebrated works of ornithology with millions of bird observations from eBird and multimedia from the Macaulay Library into a single platform where biologists and birders can explore comprehensive life history information on birds.
An in-depth overview of Birds of the World features can be found here.
Below is a description-in-brief:
Birds of the World is available by subscription to anyone in the world. View the links in the left sidebar for more information.