Are male bats actually making echolocation harder to impress the ladies?

We tend to view sexual selection as secondary to natural selection, but nothing is second to the imperative to reproduce. Sometimes that means that even precisely engineered traits like echolocation have room to be a little sexier. Could falsetto calls really be a signal of male quality in the Mehelyi’s horseshoe bat? … Read More Are male bats actually making echolocation harder to impress the ladies?

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When two become one: the evolution and development of external genitalia on land

External genitalia are an important adaptation to life on the land, where eggs may dry out and there is no water for sperm to swim through. Reptiles, birds, and mammals have extremely diverse external genitalia, but they share a common evolutionary and developmental origin. Mara Laslo explains how comparative developmental studies are shedding insight on the development of these remarkable organs. … Read More When two become one: the evolution and development of external genitalia on land

Man’s best friend– since when?

The dog is the only large carnivore that has been fully domesticated and one the few domesticated animals that was not kept primarily for food. Despite their widespread adoption into human cultures today, relatively little is known about the early events in the history of dog domestication. When and where did dogs originally become domesticated? Russ Corbett-Detig explains. … Read More Man’s best friend– since when?

That’s Bananas!—How flowers get fancier

Frivolous as it may sound to us, making pretty flowers is serious business for a plant. Fancier flowers often mean more attention from pollinators and greater reproductive success, and the huge diversity of flowers around today shows that the evolution of new flower types has paid off. But how can plants afford to experiment with such an important developmental process? As Becky Povilus explains, they do and they don’t. … Read More That’s Bananas!—How flowers get fancier