the the arrival of flocks of ------------ is a sure sign that summer is on its way.
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the arrival of flocks of birds is a sure sign that summer is on its way.
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The arrival of flocks of birds is a sure sign that summer is on its way.
Explanation:
- To meet the demands during migration, birds must alter its metabolism. Energy storage through fat accumulation and sleep control in nocturnal migrants requires special physiological adaptations. Also, a bird's feathers suffer from wear and tear and must be skinned.
- The timing of this molt, usually once a year, but sometimes twice, varies, some species molt before moving to their winter areas and others before returning to their breeding grounds.
- Aside from physiological adaptations, migration may necessitate behavioural modifications such as flocking to reduce energy consumption or the risk of predation.
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