Would it be unreasonable to go at them with a cricket bat if they dive bomb you? Not out of aggression, but self defense.

Once I was picked on by crows in my neighborhood. A few birds would swoop down and tried to / made a show of pecking me on the head. I picked up fallen twigs about the size of walking sticks which I swung above my head like a helicopter's rotors. Did that a few times and the birds stopped bothering me.

The attacks started after I walked past a crow on the ground that was apparently injured or something. Once I _made eye contact_ (!) with that crow, the others up in the tree went beserk and started the attacks.

That doesn't sound anything like self defense.

If they are trying to peck you, how is it not self defense?!

It's entirely unnecessary cruelty. Taking a weapon with you so you can retaliate after you provoke an attack isn't a defensive strategy.

Cleaning up bird corpses near human habitation habitat isn't necessary? You have curious ideas of what's necessary.

That's a ridiculous interpretation of what I said. Nobody I know has ever had to bludgeon an animal to clean their yard, not even the person whose story spawned this whole thread.