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Nature Notebook

Love is in the air for all sorts of animals, not just us humans. The primary environmental cue for animal reproduction is the photoperiod. This is measured as the number of sunlight hours versus the number of darkness hours. Each animal species has a critical photoperiod (the magic ratio of sunlight hours to darkness hours) that drives the production of hormones.

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Nature Notebook

The numerous, tiny piles of soil that indicate earthworm activity are beginning to appear in yards. The earthworm’s body is mostly water so how did it survive our bitterly cold winter?

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