A male green anole lizard flares his throat fan in a backyard in Cary, North Carolina on April 27, 2021. This pink section is actually a thin flap of skin that hangs down below the green anole's throat. Anoles are renowned for their displays in which they do pushups, bob their heads up and down, and unfurl their colorful dewlaps. The male anole uses it for two primary purposes: to protect his territory and attract a mate. (Photo by Bob Karp/ZUMA Press Wire/Alamy Live News)

The space shuttle Endeavour is transported to the California Science Center in Exposition Park from Los Angeles International Airport (LAX) in Los Angeles, California. (Photo by Kevork Djansezian)

Just Dance 2017 performance at Ubisoft E3 2016 – Day 2 at the Los Angeles Convention Center on Tuesday, June 14, 2016, in Los Angeles. (Photo by Dan Steinberg/Invision for Ubisoft/AP Images)

A person eats an early Thanksgiving meal served to the homeless at the Los Angeles Mission in Los Angeles, California, November 25, 2015. (Photo by Mario Anzuoni/Reuters)

Eugloss dilemma, male, Florida, Biscayne National Monument. (Photo and caption by Sam Droege/USGS Bee Inventory and Monitoring Lab)

The cast of The Expendables, L-R: actors Jason Statham, Sylvester Stallone, Dolph Lundgren and Terry Crews attended the ringing of the opening bell at the New York Stock Exchange on Wall Street in NYC today. There is something so unsexy (not to mention suspect) about a male who constantly takes off his shirt to flex his muscles while in the company of other alpha males.

The double compound eyes of a male St. Mark's fly (Bibio marci), submitted by Dr. David Maitland from Feltwell, UK. (Dr. David Maitland)

A woman in a wedding gown walks to a mass wedding ceremony, held 17 male inmates, in the Carcel Villa Hermosa prison in Cali, Colombia, August 19, 2016. (Photo by Jaime Saldarriaga/Reuters)