Since when did the land reclamation act include crags and birds? It's not their rock. It 'belongs' to nobody. Quite frankly, if I'm on a route and I can find a way to chock a baby bird in a crack, then hey, it's a win really.
.... and wait for mommy falcon to come peck your eyeballs out!
Or, wait for them alientjies to land and tune you it's not your planet, while pointing one of them there laser gadgets at your giant nads!
No massive tree-hugger myself, but it is rather decent to respect the little creatures that evolved and made the crags their home long before we lost our body hair and stopped scraping our knuckles on the ground (that is, most of us in this case)!
I'd love to be able to see a living dodo (the feathered kind, not the guest kind)... don't you think it'd be nice for your grandkids to see and hear a real live peregrine falcon out in the wild?