"It seems plausible that we have less responsibility to protect gazelles than we do to protect domestic dogs and cats, since we are the guardians of the latter and they have evolved in symbiosis with us. But where we can protect gazelles without the type of massive intervention that would be harm-producing, perhaps we should do so. The problem is that the needs of the predatory animal must also be considered, and we do not have the option of giving the tiger in the wild a nice ball on a string to play with."