A mentality developed by basic women often aged 18-25, often white (although can be any ethnic background). More attractive women are more likely to have bird tendencies, but all in all attractiveness does not affect bird status.
Birds are characterized by taking “bird” photos (poses that flour for attention), being negatively affected by small things going wrong, ghosting, failure to commit to anything, doing everything on a whim with no rhyme or reason, etc
Wow that’s such a basic instagram post. She’s SUCH a bird.