since no one replied to my question before. my duckling is 4 days old today. is it alright to leave his/her pool in with him/her over night. or should i take it out at night. all it is is the bottom part of a plant pot. the part that collects the extra water. it only holds about 2 1/2 to 3 inches of water. the duckling can easily get in and out without help. i do keep it in with him/her all day long.