NWCO - Nuisance Wildlife Control Operator Nuisance Wildlife Control Operator Exclusion and Habitat Modification 1 — Questions and Answers
Question 1: What is the recommended minimum depth for burying a wire mesh barrier to prevent groundhog burrowing under a deck or shed foundation?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
A minimum burial depth of 12 inches is recommended for wire mesh barriers targeting groundhogs (woodchucks). Groundhogs rarely dig past 12 inches when they encounter resistance, making this depth effective without requiring excessive excavation.
Question 2: Which chimney cap mesh size is considered the industry standard for excluding European starlings while still allowing adequate draft?
- 1/4-inch hardware cloth
- 1/2-inch hardware cloth (Correct answer)
- 3/4-inch galvanized mesh
- 1-inch poultry netting
Correct answer: 1/2-inch hardware cloth
Half-inch hardware cloth is the standard for chimney cap exclusion targeting starlings. It is small enough to block entry (starlings need roughly 1.5 inches but can probe openings) while maintaining sufficient airflow and resisting corrosion in a flue environment.
Question 3: When installing a one-way exclusion door on a primary bat colony roost, what seasonal timing restriction typically applies in most states?
- Exclusions must be completed before March 1
- Exclusions must avoid the maternity season, typically May through August (Correct answer)
- Exclusions are prohibited from October through February only
- There are no seasonal restrictions for bat exclusion
Correct answer: Exclusions must avoid the maternity season, typically May through August
Most state regulations prohibit bat exclusion during the maternity season (roughly May–August) because flightless pups would be trapped inside and die. Operators must wait until pups are volant, typically late summer, before installing one-way devices.
Question 4: Which habitat modification BEST reduces the likelihood of skunks denning beneath a residential deck?
- Applying predator urine along the deck perimeter monthly
- Removing brush piles and sealing the deck perimeter with an L-shaped mesh apron (Correct answer)
- Installing motion-activated lights under the deck
- Spreading mothballs across the soil beneath the deck
Correct answer: Removing brush piles and sealing the deck perimeter with an L-shaped mesh apron
Removing cover (brush piles) eliminates attractants while an L-shaped mesh apron physically prevents burrowing access. This combination addresses both the behavioral draw and the structural access point. Repellents and lights provide only temporary deterrence and mothballs are not a legal exclusion method.
Question 5: A homeowner reports that squirrels are repeatedly gaining access by running along power lines to the roofline. Which habitat modification addresses this pathway?
- Installing plastic pipe sleeves around tree trunks within 10 feet of the structure
- Coordinating with the utility company to install a plastic conduit sleeve on the service line (Correct answer)
- Trimming all trees within 20 feet of the structure to below roof height
- Attaching sheet-metal flashing to the fascia boards
Correct answer: Coordinating with the utility company to install a plastic conduit sleeve on the service line
Utility lines are a common highway for squirrels. A plastic conduit sleeve (PVC pipe split lengthwise and placed around the wire) spins freely, preventing squirrels from walking across it. Tree trimming and trunk baffles address tree routes but not aerial utility pathways.
Question 6: What is the primary functional purpose of installing drip edge flashing along a roofline as part of a wildlife exclusion program?
- To redirect rainwater away from foundation plantings that attract insects
- To seal the gap between the roof deck and fascia board that wildlife use as an entry point (Correct answer)
- To provide a surface for applying bird exclusion gel products
- To reduce heat transfer that draws overwintering insects attracting woodpeckers
Correct answer: To seal the gap between the roof deck and fascia board that wildlife use as an entry point
The gap between the roof deck sheathing and the top of the fascia board is a common entry point for squirrels, flying squirrels, and mice. Properly installed drip edge flashing closes this gap along the entire eave line, making it an efficient broad-perimeter exclusion tool.
NWCO - Nuisance Wildlife Control Operator Nuisance Wildlife Control Operator Exclusion and Habitat Modification 1
What is the recommended minimum depth for burying a wire mesh barrier to prevent groundhog burrowing under a deck or shed foundation?