New sarawak white pummelo tree leaves getting munched on day one

Hello all, we got a sarawak white pummelo tree on Sunday. This evening we noticed that a lot of leaves have been getting munched. Not sure if anyone here has pummelos and know what could be doing it, and how to stop it. I think some munched leaves would be fine, but hooing they don't eat to much to cause damage. I was expectingsome sort of caterpillar to be having a grand ol' time, but I only saw some small ants. I am going to do some more googling, but I figured I would ask here too. Thanks in advance