Riley attempts to eat a sprinkler

Riley is now 4 months old and loves to chew. Thankfully, he hasn't chewed on any furniture or too many of the things we'd prefer him not to. He has his toys and a pair of my grass-stained mowing tennis shoes that he's allowed to chew at will. He occassionally steals Kyra's stuffed animals if she leaves them within his reach, but she's learning to keep valued items up high. I went to bed and then a few minutes later Riley came in. I heard him chewing on something unfamiliar. I turned on the light and was surprised to see that he had brought in a sprinkler from the back yard and was chomping on it. Tasha just says "rub my belly, please!"