Why might an observer perceive basilisks as rare even if their overall population density is high?

Answer

Because they are strongly tied to the edges of water bodies, which serve as their primary escape route.

Basilisks are strongly tied to the edges of rivers, streams, and ponds. A traveler hiking deep in the forest away from a water source is unlikely to see one, leading to a localized perception of rarity.

Why might an observer perceive basilisks as rare even if their overall population density is high?
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