Oklahoma Wildlife Authority

Bats in Oklahoma – Identification, Risks & Humane Exclusion Guide

Bats are common and ecologically important wildlife in Oklahoma, particularly in Oklahoma City, Tulsa, Edmond, Norman, Moore, Midwest City, Yukon, Broken Arrow, and surrounding rural areas. While bats are beneficial for controlling insects, they can become nuisance species when they roost in attics, barns, or other structures. This page provides an Oklahoma-focused guide for identifying bats, understanding their behavior, preventing infestations, and implementing humane exclusion techniques.

Tip: Protecting bats while preventing them from entering living spaces ensures ecological balance and household safety.

Common Bat Species in Oklahoma

Oklahoma is home to over 15 bat species, but the most frequently encountered around homes include:

Little Brown Bat (Myotis lucifugus)

  • Appearance: Small, brown fur; wingspan 8–10 inches
  • Behavior: Insectivorous; roosts in attics, barns, and hollow trees
  • Habitat: Urban areas, barns, and homes

Big Brown Bat (Eptesicus fuscus)

  • Appearance: Larger brown bat; wingspan 12–16 inches
  • Behavior: Nocturnal insect predator; roosts in attics, eaves, and garages
  • Habitat: Urban and suburban structures

Mexican Free-Tailed Bat (Tadarida brasiliensis)

  • Appearance: Medium-sized; long tail extending beyond tail membrane
  • Behavior: Migratory; forms large colonies in bridges and attics
  • Habitat: Bridges, barns, and urban structures

Evening Bat (Nycticeius humeralis)

  • Appearance: Small; dark brown fur
  • Behavior: Nocturnal, insect-eating; roosts in trees and attics
  • Habitat: Urban areas and wooded neighborhoods

Most bats are non-aggressive, but proper handling and exclusion are necessary to prevent health risks.

Bat Behavior & Activity Patterns

Bats in Oklahoma exhibit:

  • Nocturnal activity – active at dusk and night
  • Roost in dark, enclosed areas: attics, barns, eaves, and tree cavities
  • Eat insects such as moths, mosquitoes, beetles, and flies
  • Travel several miles nightly to forage
  • Form colonies ranging from a few individuals to hundreds
  • Hibernate in winter (hibernacula) or migrate depending on species

Bats are beneficial predators, helping control insect populations statewide.

Food Sources & Attractants in Oklahoma

Bats are insectivores and attracted to areas with:

  • High insect populations from gardens, ponds, or lights
  • Artificial lighting that draws moths and other insects
  • Undisturbed roosting areas such as attics, barns, and hollow trees

Properties with fruit trees, water sources, and insect-rich lighting are more likely to attract bats.

Common Entry Points into Oklahoma Homes

Bats can enter structures through surprisingly small gaps:

  • Vents and soffit openings
  • Gaps in rooflines, shingles, or fascia
  • Chimneys without caps
  • Attic vents, gable vents, or cracks around windows
  • Open garages, barns, or sheds

Adult bats can enter openings as small as ½ inch, often unnoticed until a colony establishes.

Signs of Bat Activity

Homeowners in Oklahoma may notice:

  • Nocturnal squeaking, scratching, or fluttering sounds in attics
  • Accumulation of guano (droppings) under roosts
  • Stains or grease marks on rafters or beams
  • Strong ammonia odor from guano accumulation
  • Sightings of bats flying near dusk or dawn
  • Entry/exit points around rooflines or chimneys

Guano accumulation can damage insulation and pose health risks from pathogens like Histoplasma.

Risks & Damage Caused by Bats

Bats in Oklahoma present multiple risks:

  • Guano contamination of insulation, walls, and storage areas
  • Odor buildup in attics or enclosed spaces
  • Potential disease transmission (rabies, histoplasmosis)
  • Nesting materials and droppings can damage property
  • Bats in barns may prey on stored insects but generally avoid livestock

Early exclusion is important for health and structural protection.

Humane Bat Exclusion Methods (Oklahoma-Friendly)

Humane exclusion is strongly recommended:

1. Full Property & Attic Inspection

  • Identify entry/exit points and roosting areas
  • Inspect rooflines, vents, chimneys, eaves, and attics

2. Install One-Way Exclusion Devices

  • Allow bats to exit but prevent re-entry
  • Best applied after young bats are capable of flight (late summer)

3. Seal Entry Points

  • Hardware cloth, mesh, or vent covers for openings
  • Chimney caps to prevent attic access
  • Close gaps around rooflines, soffits, and gables

4. Remove Attractants

  • Minimize lighting that attracts insects near homes
  • Keep attics, barns, and sheds clean and undisturbed

5. Long-Term Monitoring

  • Inspect for new openings seasonally
  • Check attics after storms or construction work

Never handle bats directly, and always use gloves and proper safety equipment.

Seasonal Activity Patterns in Oklahoma

  • Winter: Hibernation in cool attics, caves, or mines
  • Spring: Emergence for mating and foraging
  • Summer: Birth season; roosts become colonies of mothers and young
  • Fall: Young become independent; bats prepare for hibernation or migration

Bats are most active April–October in Oklahoma.

FAQ – Oklahoma Bats

Q1: How can I tell if I have bats in my attic?
A1: Look for guano, odor, rustling or squeaking sounds at dusk, and entry/exit points around rooflines.

Q2: Are bats dangerous?
A2: Only a small percentage carry rabies. Guano can carry Histoplasma spores, so avoid direct contact.

Q3: Can bats damage my home?
A3: Yes, droppings can stain surfaces, damage insulation, and create odor problems.

Q4: How do I remove bats humanely?
A4: Use one-way exclusion devices after young bats can fly, seal entry points, and call professionals for large colonies.

Q5: How do I prevent bats from returning?
A5: Seal roofline gaps, vents, chimneys, and minimize attractants like insects near the home.

Q6: When is the best time for bat exclusion in Oklahoma?
A6: Late summer (August–September), after young bats are able to fly.