Pixar - For The Birds (2000)

This animated short starts with a group of small birds perched together on a telephone wire. When a much larger and awkward-looking bird arrives, the smaller birds reject him with taunts and insults. Still, he persists in trying to win their friendship, until at last the smaller birds decide to shove him from their perch. Only too late do they discover that there may be a problem with this plan.