All chickens and guineas were shut in the barn last night. The young chicks and keets were in their brooder box with chicken wire sides. I've been leaving the little door open and the top off so they could be part of the larger room with other older chicks that are free to roost or be in their brooder box but the young ones still sleep under the lamp in their brooder box. This morning 3 of the smallest keets were gone. Could a rat come in and take them? A snake? Three seems like a lot. Any thoughts?