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#nocturnal

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Nocturnal is not so nocturnal, nor diurnal so diurnal: almost 9 million camera trap observations indicate that less than half of 445 mammal species adhere to the diel activity pattern that is conventionally ascribed to them.

Species with a wider geographic distribution tend to be nocturnal, and smaller species tend to be nocturnal, except in the forested tropics.

Summary: scienceblog.com/wildscience/20

Original paper: science.org/doi/10.1126/sciadv

Figure 1 from the paper, consisting of a global map of observation locations, with countries colored by the number of species (the maximum is in the U.S.), and a circular chart showing the phylogeny of the 445 species, with representative silhouettes around the border.
#Science#Nature#Nocturnal
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