Evolution

The percentage of public school bio teachers who present it as the broad consensus view among scientists—without presenting the creationist “alternative”—has increased markedly since 2007

The finding of a baby dinosaur fossil in the Arctic implies that some dinos nested in the region, which was milder than today but not toasty.

The humble guppy has a surprising strategy for predators

Darwin would be delighted by the story his successors have revealed

An analysis of 391 skulls shows that birds evolved surprisingly slowly, compared with their dinosaur forerunners

Researchers found extra bones within a 240-million-year-old ichthyosaur fossil—which they determined to be the ichthyosaur’s last, possibly fatal meal. Christopher Intagliata reports.

Butterflies, fish and frogs sport rear-end eyespots that reduce predation. Painting eye markings on cows similarly seems to ward off predators.

Hermit warblers in California have developed 35 different song dialects, apparently as a result of wildfires temporarily driving them out of certain areas.

A rare cracked fossil shows the world through ancient eyes

Scientists spotted a mouse at the summit of Llullaillaco, a 22,000-foot-tall volcano on the border of Chile and Argentina. Julia Rosen reports.

Originally published in June 1894

Rather than undergoing active chameleonlike color changes, glass frogs’ translucency allows light to bounce from their background and go through them—making their apparent color close to their setting.