Below are links to online Birding sites.
A real-time, online checklist program, eBird has revolutionized the way that the birding community reports and accesses information about birds. Launched in 2002 by the Cornell Lab of Ornithology and National Audubon Society, eBird provides rich data sources for basic information on bird abundance and distribution at a variety of spatial and temporal scales.
Audubon Bird Guide
The Audubon Bird Guide is a free and complete field guide to over 800 species of North American birds, right in your pocket. Built for all experience levels, it will help you identify the birds around you, keep track of the birds you’ve seen, and get outside to find new birds near you.
With over 2 million downloads to date, it is one of the best and most trusted field guides for North American birds.
Song Sleuth is a fun and easy way to learn birding by ear. Everywhere you go, Song Sleuth can listen to the birds singing around you, and instantly show you the most likely bird species that it heard. The app provides all the tools you need to determine which is the correct bird. Save and share your recordings, and learn about each bird with the built-in David Sibley Bird Reference.
Merlin is designed to be a birding coach for beginning and intermediate bird watchers. Merlin asks you the same questions that an expert birder would ask to help solve a mystery bird sighting. Notice that date and location are Merlin’s first and most important questions. It takes years of experience in the field to know what species are expected at a given location and date. Merlin shares this this knowledge with you based on more than 200 million sightings submitted to eBird from birders across the United States and Canada.