Chris Draper, associate director at the foundation, said: “While we are relieved that this incident apparently ended without injury to visitors or to the gorilla, it is yet another startling reminder of the risks associated with maintaining dangerous wild animals in captivity.
“This incident could have ended very differently. We are calling for an urgent inquiry into the circumstances surrounding this escape, and into safety procedures at London Zoo.”
Armed police had to be called to the attraction as visitors were evacuated while keepers dealt with the emergency.
Some reported being locked inside buildings at the zoo, which is one of London’s top tourist spots.
The 18-year-old western lowland gorilla, named Kumbuka, was eventually subdued by vets and returned to his den.
In a statement, the zoo said Kumbuka “got out of his den at ZSL London Zoo and into a non-public zoo keeper area at 5.13pm.
“The gorilla remained contained within the exhibit off-show area. Staff responded immediately and (he) was tranquilised by vets.
“We can confirm he is awake and well.”
Malcolm Fitzpatrick, curator of mammals at the zoo, described Kumbuka’s escape as a “minor incident” and said visitors were “never in any danger”.
The fossil was unearthed at Blick Mead, situated around a mile from the World Heritage Site at Amesbury in Wiltshire.
Tests on the tooth reveal it belonged to an Alsatian which most likely came from the York area – and suggest it feasted on salmon, trout, pike, wild pig and red deer.
Archaeologist David Jacques, a senior research fellow at the University of Buckingham, said the domesticated animal may have been brought to Stonehenge to exchange.
He said its discovery is significant because it was not known people travelled such long distances 7,000 years ago, and it adds to the weight of evidence of people coming to Stonehenge 2,000 years before the monument was built.
Previous excavations uncovered evidence of tools from Wales, the Midlands and the West of England.
A natural spring at Blick Mead – and its fairly easy accessibility with the nearby River Avon being the M1 of its time – may have attracted people to the site, it is thought.
Burnt stones, wood and auroch bones – belonging to extinct, large prehistoric cattle – suggest it was popular with feasting.
“The fact that a dog and a group of people were coming to the area from such a long distance away further underlines just how important the place was four millennia before the circle was built,” said Mr Jacques.
“Discoveries like this give us a completely new understanding of the establishment of the ritual landscape and make Stonehenge even more special than we thought we knew it was.”
Andy Rhind-Tutt, chairman of Amesbury Museum and Heritage Trust, said: “These amazing discoveries at Blick Mead are writing the history books of Mesolithic Britain.
“A dog tooth from York, a slate tool from Wales and a stone tool from the Midlands show that this wasn’t just the place to live at the end of the Ice Age, but was known by our ancestors for a long time widely across Britain. They kept coming here.”
Footage shows the reality star walking past photographers when a man in sunglasses suddenly lunges forward and seemingly attempts to kiss her bottom.
Vitalii Sediuk was quickly pulled to the floor by a security guard.
This is the second time that Sediuk, a former Ukrainian television reporter, has targeted Kardashian.
On Instagram, he claimed his stunt was in protest at Kardashian’s use of cosmetic surgery – and called on her family to “popularise natural beauty among teenage girls who follow and defend them blindly”.
Sediuk also insisted that his attack was unplanned, adding that he was merely eating ice cream outside the restaurant and did not know Kardashian was going to be there.
Last week he grabbed Gigi Hadid as she left a fashion show in Milan, with video showing the supermodel forcefully elbowing Sediuk to loosen his grip.
Following some articles questioning her behaviour, Hadid defended herself in an interview with Lenny Letter, saying: “Honestly, I felt I was in danger, and I had every right to react the way I did.
“If anything, I want girls to see the video and know that they have the right to fight back, too, if put in a similar situation.”
After that altercation, Sediuk said the stunt was a protest against the use of celebrity models.
The prankster spent two days in jail in 2014 after he punched Brad Pitt on the red carpet of a premiere in Los Angeles.
Sediuk was sentenced to 20 days’ community service, and was photographed cleaning a park dressed in a hi-vis jacket and a tank top adorned with a picture of Pitt.
The ex-journalist also caused controversy after crawling underneath America Ferrera’s dress at a premiere during Cannes festival.
The Marine Conservation Society (MCS) has received reports of the stinging creature washing up on beaches in Cornwall and the Scilly Isles.
Sightings in UK waters are rare, with the last significant strandings being in 2009 and 2012.
The species is most commonly found in the Atlantic Ocean, as well as the Indian and Pacific oceans, but there was a spate of strandings in Ireland just a few weeks ago.
MCS spokesman Peter Richardson said: “We don’t receive reports of Portuguese man-of-war every year, but when we do they can turn up in big numbers, usually around about this time of year.
“In the last couple of weeks we’ve received several confirmed reports of Portuguese man-of-war stranded on beaches around Cornwall and the Scilly Isles.
“With the earlier strandings in Ireland, these recent sightings could herald the arrival of more of the creatures as they get blown in from the Atlantic.”
Contrary to popular belief, the Portuguese man-of-war is not a jellyfish, although it is closely related. The creature is actually a siphonophore – an animal made up of a colony of organisms working together as one.
Its stings can be agonising and, in extreme cases, lethal.
They have “tentacle-like polyps” which can be tens of metres in length, and it is these that give the sting, said Dr Richardson.
“A stranded Portuguese man-of-war looks a bit like a deflating purple balloon with blue ribbons attached, children will find it fascinating,” he said.
“So if you’re visiting a Cornish beach this weekend, it’s well worth making sure you know what these animals look like and that no one picks them up.”
One of the animals was discovered at Portheras Cove, near Morvah, Cornwall, by volunteers of the Friends of Portheras Cove environmental group during a beach clean.
Group member Delia Webb said the creature was discovered lying among plastic debris.
“We find all sorts of strange and unusual items at our tiny Cornish cove, and we have had strandings of Portuguese man-of-war before,” she said.
“They look amazingly beautiful, with hints of pink and blue, but thankfully we were aware of the potential danger lying beneath, and knew not to poke or prod it, just report the sighting to the MCS.”