monkey placing things in holes

Recently the monkey has learned how to place items into holes. For example, he has a large piggy bank with plastic coins. The object is to place the coins into the slot and the piggy makes noises. It has taken him a long time to understand this concept, but now he does and he really enjoys himself. He also has an elephant that shoots balls. You place the balls into the hole and they come out of his trunk and delight ensues. He claps and laughs and balls go flying all over the living room floor. His greatest discovery of all though is that you can fit your finger into your nose hole and it feels great inside there. He spends way too much time digging around his nose for hidden treasure and really seems to relish in this discovery. He smiles and looks at you with such pride that he has figured out that this action can be done. Luckily he hasn't quite figured out the extraction part of this action, but for now he has figured out that the tool can be placed inside the hole and I think the extraction part is just around the corner.