Thank you for your comment!
The monke plushies appear after the enemy AI collects a certain amount of plushies, or when the enemy AI grabs 5 plushies at once (the same thing happens with Mouse plushies when the player does it). I know its convoluted but I wanted to add something to spice up the gameplay a bit.
The refill bar always takes the same time to refill, but once its filled it waits until nothing is moving inside the crane machine before dropping the new plushies (this to avoid any weird stuff to happen).
I just didn't come up with any way that this info could have been shown easily on the UI of the game itself so sorry about that u.u