Mascots for Duolingo and Tripadvisor (4)

I believe the answer is:

owls

(Other definitions for owls that I've seen before include "Wise old birds - quite slow" , "Nocturnal bird" , "Slow (anag) -- birds of prey" , "Nocturnal birds" , "Slow kind of birds" .)

I've seen this clue in The Wall Street Journal.

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