But after the indignation aroused by Cecil’s death, the face of the American “killer driller” is hidden in the photos of the hunt.
Humane Society International said: “It is clear that the massacre for kicking continues.”
In a new photo – the face hidden – the man who killed Cecil the lion shows a slaughtered wild sheep.
The image was taken during a sickening trip which proves that the dentist Palmer returned to the trophy hunt.
It comes despite the global backlash that the Americans unleashed after killing the beloved lion Cecil in Zimbabwe almost exactly five years ago.
Palmer paid up to £ 80,000 for the hunting trip to Altai argali – the largest type of sheep in the world – in Mongolia.
Dr. Teresa Telecky, vice-president of wildlife at Humane Society International, said: “For trophy hunters traveling to Mongolia to kill a beautiful and endangered ram is an absolute scandal.
“The argali ram is an endangered species, so the idea that these animals can be killed for pleasure is abhorrent.
“The murder of Cecil the lion five years ago caused international shock. But it is clear that the murder for kicking continues.
“It is time for the law to stop wildlife killers by banning trophy hunting.”
The Mirror is campaigning to end the trophy hunt and calls on the British government to ban the importation of animals killed for pleasure.
Palmer’s trip to Mongolia last August is believed to have lasted up to a week, after traveling 5,800 miles from its home state, Minnesota.
Palmer and his friend Brent Sinclair met local guides before heading to the mountains to track down their prey.
The two men traveled the world together to kill animals for fun.
It is understood that the ram, said to be a “much older male,” was killed with an arrow about 30 meters away.
A source says Palmer has several other trips planned.
The insider said, “At the time of Cecil’s death, Walter took a back seat. But he has been hunting since he was little. It is a way of life for him. Walter has undertaken several hunts since Cecil’s death.
“The trip to Mongolia was his idea. The ram was on his list of hunts he wanted to carry out. “
The sheep is still in Mongolia for now. The US authorities have not yet granted the permit for it to be exported to America.
In their hunt to kill the Altai argali, Sinclair was careful not to name Palmer on social media posts, instead calling him “amigo”.
Writing on his public Facebook page, Sinclair said of the driller killer: “I have booked more hunting trips with this guy in the past 20 years than I can count.
“Together, we have traveled to many parts of the world.”
He spoke of them after they killed an elephant, but said the trip to slaughter the sheep could be “at the top of the pinnacle and hard to beat”.
He added: “Thank you, Amigo for the adventure … look forward to the next. ”
The Mirror spoke to Palmer as he stepped out of a bar in Bloomington, Minnesota, after having an early lunch.
He smiled at first, but his face turned to anger when he was shown photos of his hunt in Mongolia.
He refused to speak, driving his £ 95,000 Porsche Cayenne Turbo.
Palmer’s father of two refuses to hunt with a gun, using a bow and arrow instead.
He is known for spending hours practicing in his five-million dollar house in Eden Prairie, near Minneapolis, and in his vacation home in Marco Island, Florida.
Palmer was with Sinclair, who organized hunts for the wealthy Americans, when Cecil the lion was killed.
The magnificent creature was a huge attraction in Hwange National Park.
At the time, he was being followed by a GPS satellite collar by a research team from the University of Oxford as part of a long-term study.
The 13-year-old black maned lion was injured by an arrow, then tracked down and killed with a second dart the next morning, approximately 12 hours later.
Police investigated after claiming that Cecil had been unlawfully killed. There were charges of bait used to lure him out of his protected habitat.
However, the Zimbabwe High Court has laid charges against Palmer’s guide Theo Bronkhorst.
The court agreed with the defense that it could not be a crime because the American had a legal license to hunt.
The trip is believed to have cost Palmer around £ 40,000. Thereafter, the dentist said: “If I had known that this lion had a name and was important for the country or a study, I obviously would not have taken it.
“No one in our hunting group knew before or after the name of this lion. ”
Two weeks after Palmer’s trip to Mongolia last year, the eldest son of US President Donald Trump Jr also went there to hunt sheep.
It cost American taxpayers £ 60,000 for the cost of the Secret Service agents.
Critics argue that Trump Jr.’s love for killing big game is the reason his father lifted restrictions on imports of hunting trophies.