Compost Bin Wildlife and Welfare

Compost bins and heaps provide valuable habitat and food sources for a range of garden wildlife including slow worms, grass snakes, hedgehogs and invertebrates, creating welfare opportunities in domestic spaces.

Key Facts

Compost heaps reach temperatures of 40 to 70 degrees Celsius which attract thermoregulating reptiles
Grass snakes regularly use garden compost heaps as egg-laying sites due to the heat generated by decomposition
Hedgehogs use compost heaps for nesting, particularly hibernation sites in winter
Slow worms are commonly found in compost bins where they feed on slugs and other invertebrates
Composting reduces food waste and creates habitat simultaneously, making it a high-impact low-effort action

Welfare Considerations

Compost heaps create welfare-positive microhabitats for a range of species. Grass snakes that lay eggs in compost heaps are providing their eggs with warmth that accelerates incubation — a welfare benefit for developing embryos. Hedgehogs hibernating in compost have been disturbed and killed by fork digging, a preventable welfare harm. Checking compost before disturbing is a simple but genuinely important welfare practice. Reptiles found in compost bins are doing exactly what they should — they should be gently encouraged rather than removed, as they provide significant pest control benefits.

What You Can Do

Check compost heaps carefully before using a fork to avoid injuring slow worms, grass snakes or hedgehogs
Designate one compost heap as a permanent wildlife habitat if you have space for two
Place a piece of corrugated iron near your compost to provide reptile basking and sheltering habitat
Never use pesticides near compost areas as invertebrates are essential decomposers
Record wildlife sightings in your garden compost for citizen science schemes such as the BTO Garden Wildlife Health project