"The male hummingbirds flash their colors for sexual selection," says Kaufman. While female hummingbirds do all the work such as incubating, building a nest and feeding their young, the male hummingbirds don't have much to do other than find a mate. Looking good and flashing colors is an important part of that process.
He recalls an encounter with a male hummingbird in the wild. The bird perched in front of Kaufman and flashed his colors by simply tightening certain muscles.
"It's all instinctive," explained Kaufman. "They're doing all this without a mirror or anything."
Whatever his technique is, it's working for him. Maybe we can take a sex tip from the male hummingbird: Check the mirror less, and trust your instincts.