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Echolocation

Across
Echolocation is an ______ orientation mechanisms.
_________ is sound in the frequency range above that of human hearing.
Down
The distinct feature of _____ orientation is that the animal produces a carrier signal and uses it to extract information from their surrounding environment.
_____ are able to orient over longer distances by emitting extremely loud and highly directional and narrow calls.
_____ shift occurs when the animal and the receiver of the sound are moving towards each other.