These higher-frequency sounds do not travel as far, and so may better conceal the individuals producing them, who are especially vulnerable to predators in their ground nests.

Most often, you'll have to agree to a higher rate for a higher frequency of deliveries, he says — an arrangement that could be well worth the benefits.

While it's not easy to attribute any individual event to climate change, it is clear that a hotter planet translates into a higher frequency of extreme weather events.