Our other children

We have slowly been acquiring baby stuff and moving them into the nursery. For some reason, our pets seem to be really interested in the space. Bower, our dog, has decided that this is her new sleeping area and I will now always find her napping next to the crib. We also have two cats - Black and Grey (brothers), who are basically wild cats who sometimes decide to come home to visit. The other day I discovered Grey sleeping inside the bassinette which has been put inside the crib. I have seen him a few more times in there since then. What is it about this room that is drawing our animals?