It was a java-based game, I think. A very old one, very laggy when I first tried it out.
You could choose what kind of animal you want to be and the first animal was probably some kind of bird.
There are NPCs whom I think are interactable.
I just want a link to the site, I forgot the game's name because I had some serious amnesia when my gut hit the table corner very hard.
ALSO ITS F2P, IN 2D and VERY CLASSIC.