“Let’s have a united voice against pillage of Africa, it’s the only home we have,” it said.

The post with the photographs, published on June 16, was pinned to the top of the @africlandpost account. Since then, it has been shared tens of thousands of times and incurred thousands of comments as part of an online debate about big-game trophy hunting fueled by conservation groups, hunting advocates and groups that are against the killing of animals for sport, or for any reason.

It was not immediately clear why the photographs, which the woman had originally published on social media, resurfaced this year. Africlandpost did not respond to an email on Tuesday.

But the images generated a furor reminiscent of the killing of Cecil the Lion, who was lured off his sanctuary by a Minnesota dentist, Walter J. Palmer, during a game hunt in Zimbabwe in 2015. Protesters staked out his office and residence, and Dr. Palmer, a longtime hunting enthusiast, later apologized for killing Cecil.

He was one of many big-game hunters who have become targets online.

“These public outrages are very much in line with public opinion surveys showing an overwhelming majority of the American public opposes trophy hunting,” said Iris Ho, the wildlife programs manager for Humane Society International.

The hunter in the giraffe photographs was identified as Tess Thompson Talley of Kentucky by news organizations that said she had emailed them to defend herself. Her full given name was listed in public records as Tunessa. She could not be reached on Tuesday.