Over the past decade, the amount of people having babies around the world has plummeted, as well as the number of children the people having babies are birthing. As our population grows, we see less of a need to have 6 kids around. Surprisingly, birds are doing the same thing.
“A breakthrough study published on Friday in the journal Science uses life history theory to explain why tropical songbirds typically raise fewer chicks than temperate songbirds.”
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