Shelter seeking and construction

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Across
  1. 4. material from animals body
  2. 8. animal seeking for protection
  3. 10. animals crowd together
  4. 11. bees construct
  5. 14. wasp queens secret this for construction
  6. 15. place of refuge for birds
  7. 16. burrowing is unique to
Down
  1. 1. structure build by animals
  2. 2. webs are construction of
  3. 3. making a structure
  4. 5. animals seek shelter of trees
  5. 6. best dam builders
  6. 7. produces mounds
  7. 9. burrow the sand in summer to lower the body temperatre
  8. 12. animals does this to avoid getting smothered
  9. 13. seek shady places when ruminating