system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why the birds are not singing when it is raining?

The title says it.
gpt
Birds sing for several reasons. 1) To attract a mate. 2) To warn of danger. 3) To communicate food sources. 4) To claim territory. 

Birds tend to take shelter during the rain and avoid flying as it becomes dangerous. This means they are not going to actively be seeking food, seeking a mate, or defending territory during a rain storm. They may warn of predators but predators are also taking shelter from the rain so rarely hunting them. As such there is no drive for them to waste energy singing when there is no use for it.