Our mammal ancestors evolved to compete with dinosaurs but may have lost something in the process.

A new fossil lizard, Helioscopus dickersonae, was an ancestor of modern geckos. Its name that honors the lead researcher's grandmother and great aunt.

From dark dragonflies becoming paler to plants flowering earlier, some species are slowly evolving with the climate. Evolutionary biologists explain why few will evolve fast enough.

From dark dragonflies becoming paler to plants flowering earlier, some species are slowly evolving with the climate. Evolutionary biologists explain why few will evolve fast enough.

A study of a lizard species in Arizona revealed that nearly 70 years' worth of climate-related extinction occurred in just seven years.

Researchers in Florida want help finding brown basilisk lizards, are also called "Jesus lizards" because they can sprint across water.

The ways eastern fence lizards have changed in response to red imported fire ants demonstrate how species can adapt to survive the presence of invasive predators.

"Understanding how animals adapt to urban environments can help us focus our conservation efforts on the species that need it the most..."

Two new lizard species fill important gaps in the fossil record and offer tantalizing clues about the complexity of lizard evolution

Chowing down on fire ants might bolster lizard immune systems for attacks in the future, "somewhat like a vaccine," researchers say.