The weather is getting warmer. Flowers are in bloom, the birds are singing, the bees are buzzing, and my allergies are killing me—spring is definitely in the air. One of my favorite parts of the ...

Have you ever watched a bird fly high into the air, then plummet down toward the earth before swooping back up high, only to repeat again and again? Or perhaps you’ve smiled as you’ve watched two ...

The word gets used loosely, so the science tightened it. Gordon Burghardt, a biologist at the University of Tennessee, spent years building a precise five-criteria definition: play must be voluntary, ...

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Anyone who has ever chucked a tennis ball in the general vicinity of a border collie knows that some animals take play very seriously—the intense stare, the tremble of anticipation, the apparent joy ...