If you dont need to re-use the containers maybe drill some good sized holes in the sides for increased airflow. You could also wrap some cold packs in a towel and put it at one end.
My ducklings are 6 weeks and have most of their feathers. They have a pool in the backyard to swim in whenever they are outside so you might not have to wait too much longer.
My ducklings are 6 weeks and have most of their feathers. They have a pool in the backyard to swim in whenever they are outside so you might not have to wait too much longer.