For those who love birds and realize their importance in the future of planet earth, I hope you have already discovered The Cornell Lab of Ornithology.
It is from this institution or website that I have my best bird identifier, the free app available from your phone app store called: Merlin
The basic app is for North American birds, but includes for many countries, like Costa Rica, a download for free of your country-specific birds. The quickest, easiest and cheapest way of identifying birds you see or photograph.
And participate in the research and learning about birds plus create your own checklist of birds seen through their online base program eBird (also with a phone app):
I have also starting taking online classes on their website, the first of which is free and introduces you to eBird, your personal online record of birds seen.
One of their latest award-winning documentary videos is is worth seeing just the free 2 minute preview: Bird of Prey about the rarest eagle in the world in the Philippines.
If you love and appreciate birds, I hope you will learn about and connect with
The Cornell Lab of Ornithology