Why are caecilians rarely seen by people?

Caecilians are rarely seen by people primarily because the majority of these amphibians lead a hidden, subterranean existence in humid tropical regions.1

Their specialized morphology is adapted for life underground, featuring a compact, bony, and spadelike skull that allows them to tunnel through soil. Because they spend most of their lives in these subterranean burrows, they remain largely unfamiliar to the layperson. Furthermore, their eyes are degenerate and often covered by skin or bone, as vision is of little importance in their dark, underground environment. While they are widely distributed across tropical areas, their fossorial lifestyle effectively keeps them out of sight.2314