Question

final assessment - waterfowl ecology
waterfowl ecology
3 of 10
which of the following typically triggers migration for waterfowl?

• photoperiods
• fall and winter weather and storms
• bird begins to molt
• lack of food sources

Explanation:

Photoperiods (changes in day length) are the primary, consistent environmental cue that triggers hormonal changes in waterfowl, initiating their migratory behavior. Other factors like weather, molting, or food availability may influence migration timing or routes but are not the typical primary trigger.

Answer:

Photoperiods