Concern is high with West Nile Virus in the news. Choices are yours to enhance the balance of nature to your benefit. Bats are one choice that are looked at in different ways by our nature community. Reports of bats eating over 1,000 mosquitoes are available. The Southern Yellow Bat is a local species that uses palm trees with the fronds left on as their habitat. One web site states the two biggest enemies are the fronds being removed, thus reducing habitat, and pesticides used in mosquito control, are the most important causes for concern. Some might say the mosquitoes are the primary diet of bats and others may conclude that pesticides kill other insects bats really feed on. Bat houses are an option to increase the bat population in specific areas. The jury has not completely agreed. I would like to leave the fronds on and use as few pesticides as possible.
Other means of control include insect sprays like OFF, which last for a few hours, to sprays that have deet, can last for eight or more hours. Protective clothing, time of day, removing standing water, and keeping your lawn mowed will all help to reduce mosquitoes. Mosquito Dunks kill mosquitoes' larvae for 30 days or more. Flower pots, tree holes, bird baths, roof gutters, rain barrels, old tires, and unused swimming pools are some of the locations the dunks do a good job without hurting birds or frogs.
The Wild Bird Center in Harlingen has a good assortment of useful items to make your outdoor experience happen with fewer mosquito problems. Bob is especially knowledgeable in this area. Home Depot and Academy can also help in a few areas.
Web site on bats and my resources for most of the above include: Rio Grande Delta Audubon is not affiliated with any of the following sites, but has provided links for your convenience.

Bat Conservation International

Texas Parks and Wildlife Nature