Sometimes it seems that creationists have a view of evolution that is sort of like a science fiction piece where some individual undergoes metamorphosis and becomes a completely different sort of organism and that gives a new species.
So, when they ask about 'complete species', they really do envision evolution claiming that crocoducks should exist. I'm not sure *why* they have this image (well, except for the creationist propaganda), but it seems to be very common.
Of course that is not, nor has it ever been, what evolutionary biology claims. And, of course, it ignores that 'metamorphosis' happens between stages of the life cycle *within* a species...