I know that many of you have problems with flying/biting insects around your ponds. I work with my local DNR and wildlife agencies in bat house management.
I would be willing to bet that a few of you already use bat houses around your ponds for insect control. If not, here are some facts about bats.

A little brown bat (common to the Eastern 2/3 of the USA) can catch up to 600 mosquito sized insects in an hour.
A bat house just 24" wide, 36" tall, and 6" deep can easily house up to 500 bats.
Bat houses have been successful in every state of the USA.

Imagine an evening by your pond with a small fire burning and watching the aerial show of bats flying about and not being bothered by insects...also best enjoyed with a bell on the tip of your fishing pole while waiting for "Old Mr. Whiskers" to bite.