Blindsight

Blindsight: Can perceive surroundings without relying on sight, within a specific radius.

• Creatures without eyes, such as oozes, and creatures with echolocation or heightened senses, such as bats and true dragons, have this sense.
• If a creature is naturally blind, it has a parenthetical note to this effect, indicating that the radius of its blindsight defines the maximum range of its perception.