lair

n. den of a wild animal; hideout, secret place

A lair is a place that animals use to hide themselves, while at sleep, hibernation or when they take part in reproduction. Some lair-using animals build their lairs, others use hollows which occur naturally, like caves. In Scots, lair is also used for a burial-plot in a graveyard.In mythology, heroes have often hunted dragons and similar mythic beasts to their lairs. Consequently, fantasy role-playing games often feature monster lairs as a common place for participants to find a treasure trove.
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Noun
1. the habitation of wild animals
(synonym) den
(hypernym) habitation

(n.)
A place in which to lie or rest; especially, the bed or couch of a wild beast.
  

(n.)
A pasture; sometimes, food.
  

(n.)
A burying place.
  

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If you don't enter the tigers' lair, you cannot catch any cubs.
You have to take risks to be able to gain or win. Nothing ventured, nothing gained.