A new study on great tits in the U.K. and the Netherlands is the latest to show that natural selection is happening fast and now — and sometimes is driven by humans.

"For some dogs,” the agency explained in a series of tweets, “this just isn't the job they are meant for.”

Takotsubo cardiomyopathy, commonly known as broken-heart syndrome, typically follows an emotionally stressful event such as the loss of a loved one.

Investigators have launched an inquiry to determine why the zoo's newest employee had been assigned one of its most dangerous tasks.

“These are the most aggressive bees I think I've ever cut out of a hive,” beekeeper Mickey Hegedus said.

A former Ringling Bros. tiger escaped near Atlanta in September. But that was only the beginning of a saga that drew attention from officials in three states.

A disease linked to puppies sold at Petland, a nationwide chain of about 80 stores, has spread to 12 states.

But the storm's broad impact on the turtle population won't be clear for 25 years or so.

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