How visible is this species?
Rear Horned Baboons are fossorial, so a settled Ceratogyrus darlingi may spend long periods underground. A spider that uses a deep burrow successfully is displaying normal behaviour even if it is rarely visible.
Do not judge the welfare of Ceratogyrus darlingi by how often the spider is on display. A secure retreat is part of good husbandry even if it means seeing the animal less often.
Life stage
With Ceratogyrus darlingi, young Rear Horned Baboons and recently rehoused spiders often hide more than settled adults. Premoult can also keep a Rear Horned Baboon out of sight for an extended period.
With Ceratogyrus darlingi, a sudden change in visibility is more useful than a simple count of how many hours the spider spends outside its retreat.
Enclosure design
Give Ceratogyrus darlingi a retreat that suits its fossorial lifestyle and position routine care items so you do not have to disturb that retreat for every water change or feeding.
A display enclosure for Rear Horned Baboons can still look attractive, but with Ceratogyrus darlingi, husbandry comes first. A spider that feels secure is often easier to observe over the long term.
Do not disturb a hidden spider
Do not dig out or uncover a Rear Horned Baboon simply to make it visible. With Ceratogyrus darlingi, hiding can be linked to normal retreat use, premoult or recent disturbance.
For Ceratogyrus darlingi, leave established burrows and webbed retreats intact unless there is a genuine enclosure problem that requires intervention.
When a change matters
If a normally visible Rear Horned Baboon suddenly disappears, check water, temperature, recent disturbance and premoult signs before changing the Ceratogyrus darlingi enclosure.
If Ceratogyrus darlingi is otherwise well and the enclosure is sound, give the spider time. Visibility by itself is a poor measure of health.