I purchased two ducklings at the end of March and was amazed at how fast they grew. I'm very new to this, but I planned on building them a large pen and house in my backyard (with pool, of course) but I have noticed that they don't like being outside without me right there with them. They love their pool time, but as soon as I walk away they are at the door, wanting to be let in. Is it possible for me to have them as indoor pets? They are currently lving in a large kennel-like tub inside since I was told they cannot live outside until full feathered and adults. I want to make sure they are healthy and happy, and I don't know what keeping them indoors would do. They go outside daily right now and splash in their pool and eat grass and bugs. Is that enough? What would be the best for these guys?