burrow : Idioms & Phrases
Burrowing owl
(Zoöl.) , a small owl of the western part of North America (Speotyto cunicularia ), which lives in holes, often in company with the prairie dog.
Webster 1913
lowland burrowing treefrog
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noun terrestrial burrowing nocturnal frog of grassy terrain and scrub forests having very hard upper surface of head; of the United States southwest
northern casque-headed frog; Pternohyla fodiens.
WordNet
rabbit burrow
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noun a hole in the ground as a nest made by wild rabbits
rabbit hole.