Eurasian harvest mouse (Micromys minutus)

Short answers

Eurasian harvest mouse: How big does the enclosure need to be?

From 80×50×80 cm (for a small group; no official standard – floor area based on TVT leaflet no. 158 'Mice', height especially important because the species climbs stems up to about 80 cm high). Well-ventilated, escape-proof terrarium with fine mesh (the animals fit through gaps of a few millimetres), densely filled with reed and grass stems, bamboo canes, branches, hay and leaves in which they weave their ball nests.

Eurasian harvest mouse: What temperature does it need?

Daytime 16–22 °C room temperature; as a native species no extra heat is needed, avoid heat above 26 °C and direct sun., at night A slight drop at night is natural; not below about 12 °C.

Eurasian harvest mouse: Does it need UVB lighting?

UVB: Not needed – a bright spot with a natural day-night cycle.

Eurasian harvest mouse: How long do they live?

Life expectancy: In the wild usually under 1.5 years; in human care often 2–3 years, maximum around 4–5 years.

Eurasian harvest mouse: Is it suitable for beginners?

No – better suited to experienced keepers (difficulty: Expert).

Climate

Daytime temperature

16–22 °C room temperature; as a native species no extra heat is needed, avoid heat above 26 °C and direct sun.

Night temperature

A slight drop at night is natural; not below about 12 °C.

Humidity

50–70 % (normal to slightly more humid room air, fresh grasses; no waterlogging)

UVB

Not needed – a bright spot with a natural day-night cycle.

Enclosure

Minimum size

from 80×50×80 cm (for a small group; no official standard – floor area based on TVT leaflet no. 158 'Mice', height especially important because the species climbs stems up to about 80 cm high). Well-ventilated, escape-proof terrarium with fine mesh (the animals fit through gaps of a few millimetres), densely filled with reed and grass stems, bamboo canes, branches, hay and leaves in which they weave their ball nests.

Substrate

5–10 cm of small-animal bedding or a soil-leaf mix with a thick layer of hay; add fresh grasses and stems regularly.

Feeding

Food

Fine seeds and grass seeds (millet, canary seed, wild seeds), half-ripe grass and grain ears, some fruit and berries; in summer plenty of insects (crickets, caterpillars) as protein. Water in a shallow dish, also mist the grasses.

Feeding interval

Fresh daily; the animals eat every few hours around the clock, so food must always be available.

Key facts

Adult size

Head-body 5–8 cm, tail 5–7 cm (prehensile); 6–12 g – one of Europe's smallest rodents.

Life expectancy

In the wild usually under 1.5 years; in human care often 2–3 years, maximum around 4–5 years.

Origin

Europe and Asia to Japan; native in Germany in reed beds, tall grass and tall-herb vegetation, wet meadows and fallow land.

Protection status

Specially protected (German BArtSchV annex 1, all native mammals except the species excluded there). Red List Germany 2020: near threatened (warning list); Red List Bavaria 2017: vulnerable. Catching wild animals is prohibited (§ 44(1) BNatSchG, also § 39 BNatSchG) – only keep animals demonstrably bred in the EU. Keep proof of origin (§ 46 BNatSchG); keeping must be reported to the local nature conservation authority (§ 7(2) BArtSchV).

Brumation

None – the species does not hibernate even in the wild; in winter a cool room temperature with plenty of nesting material is enough.

Cohabitation

Group. Least stressful are small groups of females (littermates); males fight each other fiercely, and females often drive males away after mating. Separate immediately if there is unrest or injury.

Notes

Only keep captive-bred animals: wild-caught animals are prohibited, and 'rescued' animals from the wild may not be kept either. When buying, ask for and keep written proof of origin (breeder, date, number); register the keeping with the local nature conservation authority. Because of the protection rules, their sensitivity and tiny size, rather something for experienced keepers.

Do you keep this species?

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All species in the care wiki →

What you need to start

To keep Eurasian harvest mouse (Micromys minutus) you typically need: a suitable enclosure (from 80×50×80 cm (for a small group; no official standard – floor area based on TVT leaflet no. 158 'Mice', height especially important because the species climbs stems up to about 80 cm high). Well-ventilated, escape-proof terrarium with fine mesh (the animals fit through gaps of a few millimetres), densely filled with reed and grass stems, bamboo canes, branches, hay and leaves in which they weave their ball nests.), substrate (5–10 cm of small-animal bedding or a soil-leaf mix with a thick layer of hay; add fresh grasses and stems regularly.), a heat source with a thermostat, thermometer and hygrometer, a water dish and hides. You will find equipment in the Reptoria marketplace.