Elephants dying after eating plastic trash on open garbage dumps

Elephants dying after eating plastic trash on open garbage dumps



COLOMBO, Sri Lanka — The issue of trash-foraging elephants in Sri Lanka was brought to national attention thanks to a tweet by Hollywood icon Leonardo DiCaprio. Local conservationists, on the other hand, have long been warning about the problem, which they claim is caused by “short-sighted, politically motivated” planning that continues to harm elephants and people alike.

DiCaprio, an Oscar winner and environmentalist, shared a piece from the Associated Press on the growing problem of wild Asian elephants (Elephas maximus) dying after grazing in open rubbish dumps with his nearly 20 million Twitter followers on Jan. 26. In Sri Lanka, elephants are respected and frequently appear in cultural and religious activities. Despite this, many of the animals forage alongside stray dogs and crows at these rubbish dumps, which are often located near wildlife conservation zones and other protected areas.

Hollywood superstar Leonardo DiCaprio tweeted out this AP story on Sri Lanka’s garbage-eating elephants to his nearly 20 million Twitter followers, drawing global attention to the problem. Image via Twitter.
Hollywood superstar Leonardo DiCaprio tweeted out this AP story on Sri Lanka’s garbage-eating elephants to his nearly 20 million Twitter followers, drawing global attention to the problem. Image via Twitter.

“We conducted a survey around Sri Lanka and listed 54 garbage open garbage dumps visited by elephants,” Chandana Sooriyabandara, director-general of Sri Lanka’s Department of Wildlife Conservation (DWC), told Mongabay. “The department has nothing to do with the setting up of these garbage dumps, but we have to eventually deal with them as elephants frequent the dumps. We are trying to minimize the impact, but it is an uphill task as 70% of Sri Lankan elephants can also be found outside protected areas.”

While the AP reported that elephants were dying after eating plastic trash at the sites, it’s not the plastic itself, primarily polythene, says veterinary surgeon Tharaka Prasad, the current director of health at the DWC.

“A number of elephants die each year on these garbage sites, but the reason of their death is not the polythene indigestion, but food poisoning,” Prasad told Mongabay. “Lots of food waste is carelessly discarded. This waste is often tightly sealed inside polythene bags. When the food goes bad inside the oxygenless environment, the bacteria can create toxic substances and we often found this the actual reason behind the deaths of garbage-eating elephants.”

Ruminants like cows have several chambers in their digestive system that can result in the accumulation of polythene in their gut, which can ultimately be lethal. But an elephant’s digestive system is much simpler, and the polythene passes through when the animal defecates. But the plastic isn’t without its risks, as it can sometimes result in constipation, Prasad said.

Elephants await the arrival of garbage trucks. A study shows that the animals gravitate toward the dump site within 10 minutes of hearing the sound of approaching garbage trucks. Image courtesy of the Centre for Conservation and Research (CCRSL).
Elephants await the arrival of garbage trucks. A study shows that the animals gravitate toward the dump site within 10 minutes of hearing the sound of approaching garbage trucks. Image courtesy of the Centre for Conservation and Research (CCRSL).

‘Short-sighted decision’

In Sri Lanka, municipal waste is often disposed of in open garbage dumps by local government authorities. Because these sites are unhygienic and foul-smelling, local planners try to locate them in areas away from human settlements. This results in dump sites being established in areas frequented by wildlife, including elephants.

“If we take care of the garbage we generate in the urban and semi-urban areas where garbage is generated in large quantities, the question of elephants eating garbage or elephants visiting garbage dumps for fodder may not arise,” Sumith Pilapitiya, former director-general of the DWC, told Mongabay. “Garbage should be disposed of in the areas where it is generated and not near nature reserves or areas recognized as habitats for wild animals.”

Pilapitiya said that during his time at the DWC, the department often objected to new dump sites being set up in and near conservation areas, but was often ignored. He recalled the decision over where to dump waste from Dambulla, a town in Central province, where municipal planners had narrowed down two potential sites: one in a forest reserve in Digampathana, and the other on the Dambulla-Matale road, a vacant site but dotted with human settlements. Despite the DWC’s objections, the planners decided to set up the dump at Digampathana. Today, about 30 elephants regularly forage among the trash there.

The decision also created additional expenses for local authorities, who have had to set up an electric fence around the site to keep the elephants out and protect workers and equipment.

“A truly short-sighted, politically motivated decision resulted in creating a fresh problem with elephants in Digampathana with additional expenses having to be borne to support that bad decision for electric fences,” Pilapitiya told Mongabay. “The best and the cheapest solution is to avoid creating new problems in environment management.”

Elephants feed in a garbage dump alongside stray dogs and egrets. Image courtesy of Manori Gunawardena.
Elephants feed in a garbage dump alongside stray dogs and egrets. Image courtesy of Manori Gunawardena.

Eat trash or raid crops

It’s extremely rare for elephants to die while feeding at a garbage dump, says elephant biologist Prithiviraj Fernando of the Centre for Conservation and Research (CCRSL).

Fernando, a global authority on the species, who serves on the IUCN’s Asian Elephant Specialist Group, said elephants feed very selectively at garbage dumps. “If you compare the health status (body condition) of elephants at the garbage dumps with the ones found in the parks in the same area, the ones at the garbage dumps are in much better condition,” he told Mongabay. Short of locating these sites away from elephant habitat, the best thing to do is to sort the garbage, so the elephants can feed on the organic waste separately, he said.

Fernando and colleagues have studied elephant behavior at several dumps in southern Sri Lanka. They found the Uddakandara garbage dump, located near Yala National Park, is frequented by 26 elephants, and the one in Wellawaya in has around 24 elephants. The team also monitored the now-defunct dump in Kataragama, where more than 45 elephants used to feed. They calculated that with an average of 20 elephants feeding at 54 dump sites throughout Sri Lanka, that gives a population of about 1,000 garbage-eating elephants.

Elephant dung containing polythene. Veterinary officials say it’s not the plastic that’s killing the animals, but rather food poisoning. Image courtesy of the Centre for Conservation and Research (CCRSL).
Elephant dung containing polythene. Veterinary officials say it’s not the plastic that’s killing the animals, but rather food poisoning. Image courtesy of the Centre for Conservation and Research (CCRSL).

The study also found that almost all the elephants visiting garbage dumps are bull elephants. Most of them have gunshot wounds, the tell-tale sign of a crop-raiding animal that has been shot at by farmers. This complicates the question of how to keep elephants out of dump sites without driving them back into farmers’ fields.

“If you close these dumps, then these elephants will spend the time they are spending at the dump on crop raiding, so it will dramatically increase human-elephant conflict resulting in more deaths — of people and elephants,” Fernando said.

He cited the Uddakandara and Kataragama sites as textbook examples of what can happen in such cases. The government shut down the Uddakandara dump to stop the elephants from foraging in the trash. The elephants duly returned to raiding crops, prompting protests by villagers. Faced with this pressure, authorities reopened the dump site and the elephants returned to eating garbage. It was the same story in Kataragama, Fernando said, except the site remains shut.

An elephant feeds on garbage. Image courtesy of Pathum Bandara.
An elephant feeds on garbage. Image courtesy of Pathum Bandara.

“The Kataragama dump was closed, and after that, the human-elephant conflict in the area dramatically increased, together with an increase in crop raiding,” he said. “People have to invest more in putting up electric fences to safeguard their crops and houses, and both elephants and people are getting killed.”

Fernando added that, “In a way, these dumps actually reduce direct human-elephant conflict. But these dumps need to be better managed.”

Citation:

Liyanage, D. J., Fernando, P., Dayawansa, P. N., Janaka, H. K., & Pastorini, J. (2021). The elephant at the dump: How does garbage consumption impact Asian elephants? Mammalian Biology, 101(6), 1089-1097. doi:10.1007/s42991-021-00114-5

This article by Malaka Rodrigo was first published by Mongabay.com on 20 March 2022. Lead Image: Elephants feeding in a garbage dump alongside stray dogs, cattle and egrets, courtesy of the Centre for Conservation and Research (CCRSL).


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