It's called phenology. "The migration times of birds, when butterflies start flying in the spring, when plants flower, when trees leaf out ... these are all part of phenology," says Richard ...

Nude boy leaning against tree with acanthus leaf; Bare-chested young man and boy dressed as girl with vase, ca. 1899 Subscribe now to view details for this work, and gain access to over 18 million ...

It's called phenology. "The migration times of birds, when butterflies start flying in the spring, when plants flower, when trees leaf out ... these are all part of phenology," says Richard Primack, a ...

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