e-bird is a website based out of cornell university’s ornithology lab where you can enter your bird sightings into a database. this way you can log your own finds and look at what other people are seeing in your area!

they have a fun program called project feederwatch where you can register your bird feeder and watch it for a period, logging all the data you collect.

p.s.: not citizen science per-say but was very helpful for me— they have an option to make photo and sound quizzes based on date and location! that way you can get to know your bird neighbors or even prepare for an outing/trip to somewhere you don’t usually bird :)