I think kids should be included in all animal care. My daughter is 7 1/2 yrs old and has been begging for a snake as long as I can remember. She is super confident with our ball python and has no fear of it. Prior to this she was collecting wild things outside (toads, frogs, bugs, garter snakes, ect.) but I would make her release them back. I think it's great for children to be exposed to as many animals as they can. They are naturally confident in their naivety which I think is great. It sounds like your five year old is the same. A natural animal lover and I would encourage that. I work as a Veterinary Technician and my daughter is use to me bringing home fostered pets and occasional wildlife to rehab. It's a passion for her and me as well.
She now though has to learn not to run to the snake cage and handle him all the time especially after feeding and getting use to our home. But I'm sure everything will go well with your LO just as long as some boundaries are set.