pigeons, of course! there are around 352 different species, including famous ones you know and love (rock doves, wood pigeons, dodos, mourning doves, etc) and also including the weird ones we don't know very much about! like the cameroon olive pigeon (looks like it's covered in stars!) or the polynesian imperial pigeon (helping to restore native forests by spreading seeds from the fruits they eat!)
there's literally so much to say about these guys I could go for hours. but i am tired so you are just getting this.