Write NO MORE THAN ONE WORD for each answer.
Reasons why birds migrate:
Two motivating Factors
- food
- nesting sites
Example
- birds that nest in the Northern Hemisphere fly in the autumn
Exception
- provided that they have enough food, many species can endure freezing temperatures
Types of migration:
One way to classify types of migration is by the travelled.
Permanent animal residents do not migrate
Short-distance migrants move between different on a mountain
Medium-distance migrants travel within states in North America
Long-distance migrants
- move between and wintering sites
- cover distances spanning from North to South America
Origins of long-distance migration:
There are more complex reasons than just a need for , such as genetic makeup, weather, and day-length
One possible explanation is that it gave birds the opportunity to have more
Migratory restlessness:
Even migratory birds that live in a become agitated during spring and autumn
Navigation:
Birds migrating for the first time often travel on their own
Navigation is based on
- a variety of senses
- a combination of other abilities, e.g., using the sun and visual for direction
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