We have a pair of Carolina Wrens that have found their way inside our pool screen and have made a nest in an empty planter. The brood hatched yesterday. Question - the hole they come in through (over 7 ft high and very small) probably cannot be used for the hatchlings when they fledge. Also, BIG problem: we have a pool! We can leave the 2 screen doors open when we believe the hatchlings will fledge but what steps can we take to keep them from drowning in the pool as they will most likely "wander" before finding their way out?