When time is measured in 10-million-year blocks, the lines between ecosystems and animals that would never have coexisted can get blurry.

Twenty years after it was first published, Kirsten Bakis’s extraordinary novel Lives of the Monster Dogs still has a lot to say about the entwined destinies of animals and humans.

As machines fill the skies, they meet resistance from the animals who already live there.

How do owners—and fans—cope with celebrity animals’ later years?

Valentine’s Day among humans and animals, family reunions at an Indian border fence, an icy dinosaur in Latvia, snow kayaking in Estonia, International Condom Day in Mexico City, and much more

Hours of film showed the animals just living life—and suggested that, in the age of climate change, their day-to-day existence may get much harder.

A collection of recent fall photos—images of the best season

The animals have been inbreeding for millennia, and it’s putting their future at risk.