My chicks are about 5.5 weeks old, and love to go outside every day for several hours to forage and take naps in the dirt. We are almost done with their coop & run, but for now, they're still sleeping in a brooder in the garage. My question is: is it OK to put them outside in their "playpen" on a rainy day if I cover it with a tarp? I feel that it would be cruel to keep them inside all day, but it is supposed to rain all day today. It's only 65º as well, but they have most of their big girl feathers.