Dida was famed for her long tusks and aged between 60 and 65 years, the upper reaches of life expectancy for an elephant in the wild.
Madhubala is one of four African elephants being treated in Karachi by an eight-member team from global animal welfare group.
The miserable condition of the 35-year-old bull elephant has drawn international condemnation and highlighted the woeful state of Islamabad's zoo. Kaavan is set to be flown to a wildlife sanctuary in Cambodia on Sunday.
Kaavan arrived from Sri Lanka in 1985 and was temporarily held in chains in 2002 over concerns about increasingly violent tendencies. He was freed later that year after an outcry but it emerged in 2015 that he was again being regularly chained.
The landlocked southern African country which boasts the world's largest elephant population said 12 carcasses had been discovered over the past week in two villages in the northwest of the country.
Botswana Wildlife Producers Association has now asked the government to extend the hunting season which was due to commence next month, after the coronavirus pandemic spread across the globe.
Investigations showed that at least 55 elephants had died from lack of food and water in a game park in western Zimbabwe.
A large majority of countries voted in Geneva to prohibit the transfer of elephants caught in the wild to so-called captive facilities – a practice animal protection groups have long described as "cruel".
Conservationists estimate the land-locked southern African country to have around 130,000 elephants, close to a third of the continent’s population, but the government says the number is closer to 230,000, causing problems for small-scale farmers.
Customs officials seized tusks weighing in at 7,200 kg which probably came from 720 elephants that had been poached. The tusks were hidden underneath frozen fish shipped in a container from Malaysia.
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