Question

Across
4. One of the fastest birds
7. Birds build these in trees, on cliffs or on the ground
8. Grow in the wings and the tail
9. Birds bear their young in these
10.Fastest running bird, but cannot fly
Down
1. This bird's heart beats 1,000 times a minute
2. Grow close to the skin to keep birds from getting too cold or too hot
3.Scientific study of birds
5.Longest living bird - up to 60 years
6. Periodic passage of birds from one region to another for feeding or breeding

Answer 1

Answer:

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Answer 2

Explanation:

1. This “bird's heart beats” 1,000 times a minute- HUMMING BIRD
2. “Grow close to the skin” to keep the birds from getting “too cold or too hot” – SOFT FEATHERS
3. Scientific study of birds- ORNITHOLOGY
4. One of the fastest birds- FALCON
5. Longest living bird - up to 60 years- EEL
6. Periodic passage of birds from “one region to another” for ‘feeding or breeding’- MIGRATION
7. Birds build these in trees, on cliffs or on the ground- HAMERKOP
8. Grow in the ‘wings and the tail’- FLIGHT FEATHERS  
9. ‘Birds bear their young’ in these - EGGS
10. Fastest running bird, but cannot fly – OSTRICH, EMU