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Dogs come in all shapes and sizes. And a few breeds stand out for being, well, exceptionally huge. But what is the biggest dog breed in the world?

Work by volunteers and nonprofits, such as butterfly waystations and education efforts, has reversed population decline for some butterfly species.

Tortoises and turtles both have prehistoric looking shells and look very much alike, but what's the difference?

Fruit flies are annoying, but we also owe them a huge debt of scientific gratitude.

A bright pink manta ray named Inspector Clouseau is causing a splash on the runway of the Great Barrier Reef.

Locusts are just mild-mannered grasshoppers until they swarm up and become monstrous. In parts of the world, locust plagues are a way of life.

The arctic fox thrives in temperatures as low as -58 degrees F (-50 degrees C), largely because it has the warmest coat of any animal on Earth.

At 120 to 170 pounds, you might expect the Leonberger to be aggressive and hard to handle, but they're intelligent, gentle and sensitive family dogs.

Puma, panther, mountain cat, mountain lion, mountain screamer, painter, catamount and, yes, cougar. This cat has a lot of names!

Stupendemys geographicus, a prehistoric turtle the size of a small car, once roamed the soupy pre-Amazonian waters of South America.