As global temperatures have shattered records, scientists have recently documented a die-off of Amazon dolphins and a mass bleaching event in the world's coral reefs.
The animals are sending us a warning, because they are sentinels of the ecosystem, Dr. Pozo said of the monkeys. If they are unwell, it's because something is happening.
Warmer temperatures may have combined with a confluence of other factors including fires, deforestation and logging that have cornered the monkeys in smaller areas of forest with little shade, food or water.
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