The answers to the clues below will have something in common.

1. Dangerous and threatening place
2. Where to get indisputable information
3. Metaphor for a breaking point
4. Good luck charm
5. Children's string game
6. Slow going
7. Unhappy, miserable existence
8. What you may be when you're completely surprised

Answers:

1. Lion's den
2. Horse's mouth
3. Camel's back
4. Rabbit's foot
5. Cat's Cradle
6. Snail's pace
7. Dog's life
8. Monkey's uncle