Bug or Intentional?

[Solnaga]

So I felt like pissing off my tall birds and went to snag their eggs during sun set. I didn't feel like rotating my screen and used spacebar, to my surprise I hit one of the sleeping tall birds. Should spacebar attack tall birds especially when they're asleep?

[Loekoloek]

Tallbirds actually are monsters, wich means spacebar (action bar) hits them when you're close.

Beefalo's or so are friendly therefore you need to do ctrl+spacebar to attack when when not useing your mouse.