Origen

“ And seeing that after this, in order to establish (as he thinks he does) that the stork is more pious than any human being, he adduces the accounts which are narrated regarding that creature’s display of filial affection [1] in bringing food to its parents for their support, we have to say in reply, that this is done by the storks, not from a regard to what is proper, nor from reflection, but from a natural instinct ”

“ For although rarely, yet sometimes it has been recorded that, after their apparent tameness, they have broken out against men in the most savage manner, and have committed murder, and have been on that account condemned to death, because no longer of any use. ”