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Theridiidae

Western black widow

Latrodectus hesperus
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AdvancedNocturnal · sleeping nowHuman-verified sheet
14:00
Day

Drag the sun. Western black widow is nocturnal, so what it is doing changes with the light.

Temperature

24–29°Ambient

One ambient band, 24–29°C. This sheet states no warm side, no cool side and no night figure, so none are shown.

Humidity

45–60%Target RH
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The numbers

Enclosure
10 × 10 × 18 cm
Diet
Crickets, flies, small roaches · 1-2 items weekly
Temperature
24-29°C
Humidity
45-60%

Identity

Order / Family
Araneae
IUCN / CITES
Not CITES-listed; IUCN not assessed
Difficulty
Advanced (experts only)
Commonality
Specialist keepers only
Adult size
Body ~1-1.5 cm female (black, red hourglass)
Lifespan
1-3 years (females)
Growth rate
Medium
Activity & niche
Nocturnal cobweb sit-and-wait ambusher
Temperament
Shy, not aggressive — but venom is dangerous
Venom / defense
Medically significant venom (latrotoxin, latrodectism) – advanced keepers only; NEVER handle
Price (THB)
350-800 (indicative import)

Enclosure and conditions

Temperature
24-29°C
Humidity
45-60%
Min. enclosure
10x10x18 cm (vertical) with web anchors for one adult
Substrate
2-3 cm coco; web-anchor twigs/cork
Hides / decor / water
Twigs/cork for web, water via misting

Diet

Staple food
Crickets, flies, small roaches
Feeding frequency
1-2 items weekly
Supplements
Not required

Behaviour and handling

Handling
Never
Communal
No — solitary/cannibalistic
Defense / stress signs
Drops from web, plays dead, retreats

Reproduction

Reproduction
Oviparous — papery egg sacs with hundreds of spiderlings; not live-bearing

Common health problems

Common health issues
SignsDehydration; bad molt
Red flags / quarantine
SignsEscape-proof labelled enclosure; tools only; verify legality/competence; QT wild-caught

Good to know

  • Produces some of the strongest silk of any widow, used to suspend prey much larger than itself

Others in this group

Sources