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This is Scientific American 60 Second Science. I'm Suzanne Bard.

We recognize our friend's faces,

and we're not alone.

Many social animals can identify individuals of their own species by their facial features.

That's important because they need to be able to adjust their behavior depending on who they encounter.

And research has shown that some species of monkeys, birds, and domesticated animals can even

distinguish among different faces by looking at photographs alone.

Scientists have also wondered whether domesticated animals that have co-existed with people

for thousands of years can recognize different human faces. for

example, we've shared more than 5,000 years of our history with horses.

Plus, they can live up to 30 years and may need to retain a great deal of information about us throughout their lifetimes.

Ephologist Lea Lonsad of the French National Research Institute for Agriculture, Food, and Environment

did an experiment to find out how well horses can recognize individual people in photographs.

She and her team first taught the horses how to choose between two side-by-side images

by touching their noses to a computer screen.

The horses were then shown photos of their current keeper alongside

faces of unfamiliar humans. They had never seen photos of any of the people before. The horses

correctly identified their current keeper and ignored the stranger's face about 75% of the time,

significantly better than chance. What's more, the horses also preferentially picked photos of their

...