Plus, it’s kinda our fault that they’re everywhere, since city pigeons are actually dometic animals that have gone feral

lemm.ee isn’t even that small. It’s the 6th largest active lemmy instance iirc

There are plenty of plant sources of Omega 3. Flax seeds, walnuts, soybeans, and canola oil all have decent amounts of omega 3 in them. As for protein, legumes generally have a bunch.

Really, the only thing a vegan needs to supplement is B12, but even that gets added to a bunch of stuff like breakfast cereals and plant milks if you consume those.