Animals shouldn't be idealized in this way. Yes, they never do anything immoral, because they have no concept of such things, and their lives are very different from ours. However, if they were human and did the things they did it would be considered immoral.
For example when a male lion wants to take over a pride it fights the current male lion often fatally wounding him or at least driving him out, and then he goes in and kills all the current cubs. Sometimes the female lions try to protect their cubs but once the cubs are dead, within a short time they are ready to be pregnant again and they flirt shamelessly with the new male lion and have cubs with him. This is normal for lions. While sad, it's not immoral or evil or anything like that. In nature this ensures that the strongest father sires cubs, helping the species in general.However, imagine if a human being did this kind of behavior.
A man sees a woman he wants and murders her husband, and then he kills her baby. After the baby is dead the woman willingly gets together with the murdering man and then has babies with him until another man comes along and murders him or drives him out, then the same thing happens again. See how horrible it is for humans to behave this way? It's just not the same at all.
When I say that Muslims or other vile people behave like animals, what I'm really saying is that like animals, they behave savagely with no apparent moral compunction. Instead they should behave like a human who is held accountable for their actions and show kindness to others.