Puzzling Animal Behavior

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Across
  1. 2. a collection of similar cells in the body
  2. 3. a cell with a nucleus is _____
  3. 5. an area occupied by an animal or a group of animals from which other members of the species are excluded
  4. 6. fixed object an animal uses to find its way
  5. 8. an organism that eats other organisms
  6. 11. a period of reduced activity that some animals experience in summer
  7. 13. special behaviors that an animal uses to find a mate
  8. 14. a way to send a visual message
  9. 15. an example of asexual reproduction
  10. 16. a group of tissues that carry out a special function of the body
  11. 17. any animal with a backbone
  12. 18. a behavior that comes from experience or observing other animals
  13. 22. a period of inactivity that some animals experience in winter
  14. 23. lions live in groups called _____
  15. 24. to travel from one place to another in response to the seasons or environmental conditions
Down
  1. 1. an internal control of natural cycles
  2. 4. takes place when a signal travels from one animal to another and the receiver of the signal responds
  3. 7. an animal that is eaten by another animal
  4. 9. made of many cells
  5. 10. chemicals that animals produce for communication
  6. 12. an animal without a backbone
  7. 19. _____ rhythms are daily cycles
  8. 20. behavior that is influenced by genes and does not depend on learning or experience
  9. 21. this type of behavior is the interaction between animals of the same species
  10. 23. an animal that eats other animals
  11. 25. an organism in an early stage of development