The document discusses bird migration, summarizing some past beliefs about why birds disappeared seasonally and what is now known to be correct. It then discusses the main reasons why birds migrate, including changes in temperature, evolution, glacial cycles, molting, and diet choices. Finally, it outlines some of the patterns, preparations, navigation techniques, hazards, and return process involved in bird migration.

1. BIRD MIGRATION Soham Sabnis [email_address]

12. PREPARATIONS FOR THE JOURNEY

15. molt

27. M.L.P.K.M

28. Migration champs

31. Look at the bird Up in the treetop, Building its nest With no time to stop. Hatching its eggs So smooth and so round, Then feeding its babies Worms from the ground. Look at the bird With beak for a mouth. When it gets cold, The bird will fly south. When it gets warm, The bird will return. Let's watch how the birds live, And see what we learn.