Are there? I think that all animal suffering is bad. And I think that in general more living creates is a moral good. But I'd argue the right to remain alive once alive only really kicks for animals that can make plans about the future. So I'd feel qualms about euthanizing a raven or parrot, but not a chicken.
I think that in the absense of a "god" to tell us, everyone has to come to their own conclusions about where they draw moral lines. For me specifically I think that being able to make plans about the future is a superficially appealing but pretty bad way to decide. For a start there are humans who (because of brain-damage or whatever) lack the ability to make meaningful plans.
