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Across 2. The insect which can live for weeks without a head 4. The animal which can sleep for 3 years without eating 6. An animal which can clean its ears with its tongue 8. The nimal which can remain standing after death 10. The fish which sleeps with only one eye closed 12. The bird which can sleep while flying 14. The animal which can move its eyes independently 16. The milk of this animal is pink in color 17. The only cat in the world which can't retract its claws 19. The only animal which walks sideways

Down 1. A well-known flightless bird 3. The only bird which can fly backwards 4. An animal which has its heart is in its head 5. An animal which can eat its own weight within a day 7. An animal which lays eggs 9. The eyes of this animal have rectangular pupils 11. The land animal which is 1 inch tall at birth 13. The animal which has 32 brains 15. An insect with five eyes 18. The animal which sleeps while standing