What to expect
Silver Grey Earth Tigers come from Thailand and are kept as fossorial tarantulas. Adults reach around 13–15 cm, with fast growth. In the UK hobby, the species is currently best described as rare.
Do not expect every Silver Grey Earth Tiger to behave identically. Appetite, retreat use, webbing and confidence in the open can vary between individuals, so use the species' normal lifestyle as a guide and adjust to the behaviour of the individual spider.
Enclosure setup
Silver Grey Earth Tigers are fossorial, so deep, compactable substrate is more important than a large open floor. Give the spider enough depth to build a stable burrow, with a piece of cork or a starter tunnel if you want to give it an obvious place to begin.
Once a Silver Grey Earth Tiger has established a burrow, leave it alone unless there is a genuine husbandry problem. Moved soil, webbing around the entrance and long periods out of sight are normal for a fossorial tarantula.
Temperature and room placement
A practical temperature range for Ornithoctonus costalis is 22–27 °C; stable warmth with strong ventilation. Stable room conditions are more useful than chasing a precise number every hour. Check the shelf where the enclosure actually sits, especially during very warm weather and through winter.
For Ornithoctonus costalis, keep the enclosure away from direct sunlight, radiators and electronics that create local hot spots. Do not attach a heat mat directly to the enclosure; if the room is genuinely too cold, warming the room is easier to control than creating one concentrated hot surface.
Moisture, water and ventilation
For Silver Grey Earth Tigers, the moisture approach is straightforward. Use deep moisture-retentive substrate with a drying surface and a dependable water dish. You do not need every part of the substrate to be equally wet, and persistent condensation or a stale smell usually means the enclosure is staying too damp.
Keep a clean water dish available for Ornithoctonus costalis once the spider is large enough to use one safely. Smaller juvenile enclosures can dry faster than adult setups, so adjust how often you add water to the actual drying rate rather than following a fixed calendar.
Feeding
Feed Silver Grey Earth Tigers according to their size, appetite and abdomen rather than a fixed weekly schedule. Use established feeder insects that the spider can overpower without a long struggle, and remove live prey if it is ignored.
Young spiders usually eat more regularly while they are growing. Adults can go much longer between meals. If Ornithoctonus costalis begins refusing prey and spends more time hidden, premoult is one of the first normal explanations to consider.
Growth and moulting
Growth in Ornithoctonus costalis is fast. Young Silver Grey Earth Tigers generally moult more often than large juveniles and adults, and appetite often changes as a moult approaches.
During premoult in Ornithoctonus costalis, remove live prey and keep fresh water available. After a moult, leave the spider undisturbed until the new exoskeleton has hardened and the fangs have darkened before offering food again.
Temperament and safe maintenance
Silver Grey Earth Tigers should be treated as hands-off animals. Use long tools for maintenance, keep a catch cup ready when rehousing and assume the spider may move quickly when the enclosure is opened.
Do not use handling as part of routine care. With an Old World species such as Ornithoctonus costalis, good enclosure design matters because it lets you refill water, remove leftovers and carry out maintenance without forcing close contact.
Male and female lifespan
Male Ornithoctonus costalis are generally expected to live around 2–3 years, while females can live 10–12 years. These are broad captive ranges, not exact lifespans, and individual growth history can shift maturity earlier or later.
Female Ornithoctonus costalis continue moulting after maturity. A mature male eventually reaches his ultimate moult and may become more active around the enclosure while feeding less often. Keep moult dates if you want a clearer picture of age, growth and sex over time.
UK availability and naming
In the UK hobby, Silver Grey Earth Tigers are currently classed as rare. Availability can change quickly between specialist stock lists, captive-produced batches and show weekends, so treat that label as a guide rather than a promise that a particular size or sex will always be easy to find.
Older hobby material may use the name Haplopelma costale. Keep older labels in your records if they came with the animal, but use Ornithoctonus costalis when checking current husbandry or taxonomy.
Long-term care
Long-term care for Ornithoctonus costalis is mostly about consistency. Keep the enclosure secure, maintain fresh water, feed sensibly, respect the spider's retreat and make changes only when the setup stops working for the animal.
Rehouse a Silver Grey Earth Tiger when the existing enclosure has genuinely become cramped or awkward to maintain, not simply because the spider touches the walls. Prepare the new enclosure completely before moving the spider so the transfer itself can be kept short and controlled.