Natural micro-habitats

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CASE STUDIES //

Natural micro-habitat features such as logs, rocks, and dense vegetation providing shelter and foraging opportunities for lizards, invertebrates, and other native fauna in Aotearoa New Zealand.

Definition

Natural micro-habitats are small-scale landscape features that provide shelter, thermoregulation, refuge, and foraging opportunities for native fauna within urban and modified environments.

What this strategy does
Introduces or retains logs, rocks, hollows, and dense vegetation, as well as basking areas for lizards, to support the everyday habitat needs of native species while avoiding large-scale earthworks or intensive ecological reconstruction.

Context
In Aotearoa New Zealand’s urban and peri-urban landscapes, habitat fragmentation and predator pressure limit fauna persistence. Carefully designed natural micro-habitats can improve survival where larger habitat restoration is constrained, if predation and ecological trap risks are actively managed. Ecological traps occur when animals are attracted to habitats that appear suitable but are actually poor quality or harmful, reducing their chances of survival or reproduction.

Technical considerations

Design considerations

Location
Locate micro-habitats in sunny, sheltered positions; prioritise north-facing orientation to support thermoregulation for reptiles.

Materials
Use natural, untreated materials (local rock, logs, driftwood). Avoid treated timber or materials that may leach toxins.

Rock piles
Construct rock piles with varied void sizes, including narrow refuges (<40 mm) that exclude rodents while retaining thermal mass. Rock piles are deliberately arranged clusters of stones designed to mimic the kinds of habitats many native lizards naturally use.

Vegetation
Maintain adjacent low, dense native vegetation to provide cover and foraging while preserving open basking surfaces for reptiles.

Implementation considerations

Design priority
Link micro-habitats to nearby cover or corridors to enable safe retreat from predators and extreme weather.

Key constraint
Poorly sited or overly exposed features can increase predation risk or function as ecological traps.

Relevant tools or standards
Use Department of Conservation and Predator Free New Zealand guidance when designing lizard-supporting habitats.

Issues and barriers

Predator concentration
Micro-habitats may concentrate predators, particularly cats and invasive mammals, without coordinated predator control.

Public acceptance
Perceived “messiness” can reduce public acceptance unless visual cues to care (edges, signage) are incorporated.

Slow establishment
Biodiversity gains may be slow or variable, particularly in highly modified urban settings.

Synergies and opportunities

  • Human wellbeing – Increased daily contact with visible urban nature supports mental wellbeing and stewardship.
  • Empowerment – Community-led installation and maintenance builds ecological literacy and long-term care.

Financial case

Ecosystem services and/or performance value

Value type
Supports pollination, pest regulation, and soil processes through invertebrate and reptile persistence.

Cost-effectiveness

Investment logic
Relies on low-cost, locally sourced materials and volunteer labour, delivering ecological benefit with minimal capital input.

Monitoring and evaluation metrics

Core metric
Occupancy and repeat use by target species using visual surveys, camera traps, and community science platforms.

Advanced or long-term metric
Changes in species richness, predator activity, and functional connectivity across sites.

Case study

Tawatawa Reserve lizard garden

Additional resources or tools

iNaturalist NZ
https://inaturalist.nz/

Forest & Bird – Creating lizard-friendly habitats
https://www.forestandbird.org.nz/resources/how-create-lizard-friendly-garden

Predator Free New Zealand Trust – Lizard-friendly garden guidance
https://predatorfreenz.org/stories/create-lizard-friendly-garden/