I have recently heard chinchillas and degus actually are omnivores eating bird eggs and insects as well as plants. Is this true?

I've never had either animal or looked into them much. I just looked a little more on the internet. Both chichillas and degus are predominantely vegetarian but they will eat insects on occasion. They would probably eat small eggs if they had access to them as well.

My guinea pigs occasionally eat bugs that are in their enclosure.