eBird

Summary: 
Follow this link for a website which allows you to record bird sightings and observations and share them with other users and researchers.
Description: 

"eBird began with a simple idea - that every birdwatcher has unique knowledge and experience. Our goal is to gather this information in the form of checklists of birds, archive it, and freely share it to power new data-driven approaches to science, conservation and education".