Park officials claim the mass culling was necessary to protect the
Some 3,652 wild horses were shot from a helicopter by a team of rangers in the Australian national park.
A further 1,965 buffalo, 294 pigs as well as some donkeys were slaughtered in the ariel culling.
Much of the land, which was fully listed as a UNESCO site in 1992, is still owned by aboriginal Bininj and Mungguy people who have been rooted in the land for tens of thousands of years.
Aborigines have lived in Kakadu for tens of thousands of years
But park officials claim the mass culling – the biggest since 2009 when 7,000 so-called-pests were killed – was necessary to protect the "sensitive ecosystem" of Kakadu.
Park manager Pete Cotsell said: “There has been a rising appetite to reduce the animals, which were spreading at an alarming rate according to surveys last year.
“Removing large feral animals allows native plants near rivers, billabongs and springs to regenerate, improving feeding and breeding habitats for aquatic life.
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3,652 wild horses were shot from a helicopter by a "highly skilled" team
“This leads to increased birdlife in Kakadu and improves hunting and fishing for Bininj and Mungguy.”
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Much of the 24-day culling spree focussed on the 140 mile long Mary River.
Mr Cotsell added: "In the most sensitive ecosystems of the park these animals are probably causing damage.
A further 1,965 buffalo were executed as part of the cull
"Six thousand animals equal 24 thousand hooves moving along water courses, digging in the mud and keeping birds away from pristine wetlands."
The park agency hopes to work with the Bininj and Mungguy traditional owners to develop an animal disposal industry in areas near the roads which run through Kakadu – using the hunted animals as "pet meat".
And a further wild pig cull is is planned for August, with rangers choosing to target the animals during the dry season when they gather at waterholes to drink.