The glowy lizard thing never attacks any other animals, even though it seems like he's clearly a carnivore, yet the others are herbivores. However, I've seen two different types of villagers fight...

Also, I think you're supposed to get some materials from the animals for the first donation altar thing, but I've not managed to hunt them, even though I repeatedly stood on a platform and shot one that hid below (and his weird behavior was that when he got shot, he ran literally 5 meters away, and then turned 180 degrees and came back to the exact same hiding spot and sat down again, and just took another shot to the face).