Before I post a bug report, can I check I haven’t missed something obvious?
I put a young panther, bear and rhino in the armored animal pen yesterday. I supplied exotic flesh (panther) plant fibre (rhino) and honey (bear).
The panther completed just fine. The rhino and bear each took just one unit of food, and now about 12 hours later they are both apparently stuck on around 25%. According to the wiki they should be finished in 6 hours.