Small mammals
Insectivores (other)
Musk shrews and other shrews
Most important: Never let food run out. A few hours of hunger can be fatal
Basics
- Lifespan
- 1.5–3 years (wild species even shorter)
- Weight
- 30–100 g (males larger)
- Temperament
- Nervous and fast-moving. Dislikes being held even when tame
- Care difficulty
- High (dies after a few hours without food; strong odor; short-lived)
- Legal status
- Capturing wild shrews is prohibited under the Wildlife Protection and Hunting Management Act
- Key point
- Never let food run out. A few hours of hunger can be fatal
Ecology & traits
- Body
- Body length 8–15 cm. Long pointed snout, tiny eyes, scent glands on the flanks. Relies on smell and hearing
- Origin & range
- The musk shrew is native to South Asia; in Japan it is found in the Southwest Islands
- Wild habitat
- Grassland, fields and crawl spaces near houses. Other shrews live in forests and damp grassland
- Activity & sleep
- Crepuscular to nocturnal. Alternates short naps and feeding all day long
- Social behavior & people
- Solitary and territorial. Adults fight fiercely with each other
Characteristic behaviors
- Caravanning: young follow the mother in a line, each gripping the rump of the one ahead
- Squeaks shrilly and probes surroundings with ultrasound
- Unlike rodents, it can vomit and gets motion sickness
Common illnesses: warning signs & prevention
Hypoglycemia / starvation collapse
SignsStaggering, not moving, cold body, seizures. Occurs after only a few hours without food
PreventionAlways keep food in several spots. Check the amount left before going out and before bed. Weigh weekly
Hypothermia
SignsSluggish, curled up and shivering, cold to the touch. Worsens rapidly below 20°C
PreventionKeep 22–28°C year-round; in winter combine a panel heater with a heat lamp. Check the thermometer at eye level
Tooth wear / periodontal disease
SignsLeaves hard food, drooling, bad breath, chewing on one side, facial swelling. Common in older animals
PreventionDo not rely too heavily on very hard dry food. Check the mouth monthly. See the vet if eating habits change
Diarrhea / enteritis
SignsSoft or watery stool, soiled anal area, reduced appetite. Triggered by sudden diet changes or raw meat
PreventionSwitch foods gradually over several days. Avoid raw meat; cook it. Remove leftovers within a few hours
Tumors
SignsLumps on the body, swollen mammary glands, bloody urine, sudden weight loss. More common after 18 months
PreventionNo prevention. Feel the whole body for lumps monthly. Get a checkup as the animal nears 2 years
Dermatitis / external parasites
SignsHair loss, dandruff, scabs, itching, sores around the scent glands
PreventionKeep bedding clean and dry. Have new animals checked for parasites. Buy feeder insects from a reliable shop
Warning-sign checklist
Check once a day. If even one applies, contact an animal hospital early.
First aid for illness
Staggering / not moving
Suspect hypoglycemia. Offer a favorite food at the mouth first. If it will not eat, rub sugar water on the gums with a fingertip, keep it warm and see a vet within 1 hour
Cold body
Wrap in a towel with a hot-water bottle alongside and warm gradually over 30 minutes to 1 hour. Feed as soon as it starts moving. If no recovery, see a vet the same day
Ongoing diarrhea
Go back to easily digested food, bring a stool sample and see a vet the same day. Watery stool, bloody stool or no appetite: see a vet immediately
Eating oddly / drooling
Switch to soft food to keep it eating, and see a vet within 2 days. If it stops eating entirely, see a vet within a few hours
Common injuries: prevention & first aid
Bite wounds (cagemates)
PreventionAlways house adults alone. Never house two males together. For breeding, allow only brief supervised introductions
First aidSeparate at once and press the bleeding area gently with clean gauze. Deep wounds: vet the same day. If bleeding will not stop: vet immediately
Fractures / dislocations
PreventionNever drop from 30 cm or higher. Do not use wire-mesh floors or wheels with gaps
First aidIf it drags a leg or squeaks when touched, do not handle; put it in a small box to rest. Keep warm and fed, and see a vet the same day
Tail / leg lacerations
PreventionEliminate wire mesh and cracked plastic. Avoid fabric items that catch claws
First aidPress with gauze to stop bleeding. If the tail skin has come off, keep it moist and see a vet. Heavy bleeding: vet immediately
Contact burns from heaters
PreventionPlace heaters out of direct reach. Install heat lamps with a wire guard
First aidCool the area gently with wet gauze and check the cage temperature. Red or peeling skin: vet the same day
Zoonoses (diseases that can spread to people)
Salmonellosis
RouteHands that touched feces, the cage or feeder insects
PreventionWash hands with soap after care. Do not do cage care at the table or in the kitchen. Handle raw meat carefully
Ringworm (dermatophytosis)
RouteContact with skin or hairless patches
PreventionHandle animals with hair loss or dandruff with gloves. If a person develops a ring-shaped rash, see a dermatologist
Bacterial infection from bites
RouteBacteria entering through a bite wound
PreventionDo not grab suddenly with bare hands. If bitten, wash under running water; see a doctor if swelling or fever develops
Tick-borne diseases
RouteTicks on wild-caught animals or on bedding
PreventionDo not bring in wild animals. Use only clean commercial bedding. If you find a tick, see a vet
Husbandry: food, water, toys, nest, bedding
Food
- Keep insectivore or high-protein dry food available at all times
- A few crickets or mealworms daily, plus boiled egg or chicken breast
- Refill 3–4 times a day in portions; put out more at night
Water
- Provide both a shallow dish and a water bottle
- Change daily. When hungry, water alone will not keep it alive
Never feed
- Fruit, sweets, grain-based small-animal food
- Raw pork, seasoned meat, processed food
- Onions and relatives, chocolate, caffeine, avocado
Toys & play
- A solid-surface wheel at least 20 cm in diameter
- Foraging play: hide insects in leaf litter or chips
- Narrow tunnels such as toilet-paper tubes
Nest, bed & hideout
- Two dark, snug wooden or plastic hides
- Stuff with tissue or hay and let it build its own nest
Bedding & litter
- A thick layer of hardwood chips or paper chips
- Strong odor, so replace soiled areas daily
- Hard to litter-train; at most put a sand dish in a corner
Housing: cage, exercise, temperature & humidity
Cage / housing material
An escape-proof glass tank or plastic case. Wire mesh injures claws and snout
Size & space
At least 45 cm wide. Prioritize floor area; width over height
Layout
- Spread food dishes across 2–3 spots
- Heat half the floor so it can move away from the heat
- Place hide, wheel and feeding area apart from each other
Placement notes
- Away from direct sunlight and air-conditioner drafts
- A quiet spot free of vibration and loud noise
Exercise, free-roam & walks
- Free-roaming is unnecessary and carries a high escape risk
- A wheel and foraging inside the cage provide enough exercise
- It is fast and slips into gaps, so never put it on the floor
Temperature & humidity
Temperature22–28°C. Below 20°C and above 30°C are dangerous
Humidity40–60%. Dampness causes dermatitis
Summer & winter
- Summer: keep below 28°C with air conditioning; never let water run out
- Winter: use two types of heater and prepare for power outages
Grooming & protection from predators
Nail trimming
Only if overgrown and catching. Restraint is difficult, so have the vet trim them
Brushing, skin & coat care
Not needed. Provide a sand-bath dish and it grooms itself. Scent-gland odor does not wash off
Other care
Wipe scent-gland rub marks with a mild detergent. Teeth stay healthy naturally on firm food
Protection from predators
- Do not keep in the same room as cats, dogs or ferrets
- Beware of snakes and crows getting in through gaps in screens
- Screens and clean bedding to keep out mosquitoes and ticks
Care precautions (accident prevention)
Foreign-body ingestion
Easily swallows bedding or tissue. Do not use cotton or thin-thread bedding. If no stool and a bloated belly, see a vet the same day
Being stepped on
Fast-moving and may dart underfoot. Never put it on the floor. If stepped on, keep warm; if it cannot move or is bleeding, see a vet immediately
Getting pinched
Easily caught in cage lids or sliding doors. Check its position when opening and closing. If pinched, free it at once; if it drags a leg, see a vet the same day
Falls
Jumps off hands and breaks bones easily. Hold it low, close to the floor. After a fall, rest it in a box and see a vet the same day
Escape
Escapes through gaps of a few millimeters. Always lock the lid. If it gets out, close off the room, put a food dish on the floor and wait quietly at night
How to safely release a bite
Never do this
- Shake your hand to fling it off
- Force the mouth open
Safe release procedure
- Keep your hand still and lower it close to the cage floor
- Bring a favorite food to its nose with the other hand
- Once it lets go, withdraw your hand quickly
- If it will not let go, blow gently on its face
After the release
Wash with running water and soap, then disinfect. Even tiny fangs bite deep; see a doctor if swelling or pain persists
Emergency care manual
Go to an emergency vet now (life-threatening)
- Not moving, cold body, seizures
- No response to food placed at the mouth
- Bleeding from the mouth or nose, or bleeding that will not stop
- Labored or open-mouth breathing
See a vet the same day
- Food untouched for half a day or more
- Watery stool, bloody stool, soiled anus
- Dragging a leg or sluggish after a fall
What to tell the vet & what to bring
Time and amount last eaten, body weight, thermometer reading. Bring the actual stool, vomit and food
Checking consciousness, breathing & heartbeat
- Touch lightly with a finger and watch for whisker or leg response
- Breathing is fast, over 100 per minute; check by belly movement
- Heart rate is several hundred per minute and hard to count by hand
Resuscitation steps
- Do not perform chest compressions; the body is too small and it is dangerous
- First wrap in a towel and warm with a hot-water bottle
- Rub a thin layer of sugar water on the gums to supply sugar
- Go straight to the nearest emergency animal hospital in that state
Stopping bleeding
- Press gently with clean gauze for 2–3 minutes
- On legs or tail, use only pinching pressure with the fingers
- Do not use antiseptic or styptic; go to the vet as is
Transport
- Put a cloth and a hot-water bottle in a small plastic case
- Always include a food dish, keep it dark and do not jostle
Learn with the case method
Case method (50 scenario questions)
Multiple-choice scenarios covering illnesses, injuries and accidents that can happen to Insectivores (other), with answers, explanations, issues and improvements.
Start the questions
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