A shocking toxicology report has confirmed the cause of death for two endangered four-horned antelopes, known as chousinghas, at the Delhi Zoo last December. The investigation points to poisoning from rodent control chemicals used within the zoo premises.
IVRI Report Confirms Presence of Toxic Phosphine
The forensic analysis was conducted by the prestigious Indian Veterinary Research Institute (IVRI). According to their findings, samples from the rumen and intestinal content of the deceased antelopes tested positive for phosphine. This toxic gas is typically released by rodenticides like aluminium phosphide and zinc phosphide.
The report, dated December 18, clearly stated that the samples were negative for other common poisons such as cyanide, nitrate-nitrite, heavy metals, and standard pesticides. This narrows down the cause to the phosphide-based rodenticides. A senior zoo official indicated that the animals' fatal exposure likely occurred due to contact with these pest control substances.
Timeline of the Tragic Incident and Immediate Aftermath
The zoo suffered the loss of the two rare antelopes in quick succession. The first chousingha died on December 11, followed by the second one the very next day, December 12. The swift mortality prompted an immediate forensic investigation to determine the exact cause.
In response to the deaths, zoo authorities have quarantined two other chousinghas from the same enclosure as a precautionary measure. Their health is being closely monitored to prevent any further casualties.
Conservation Significance and Legal Protection
The incident highlights a grave concern for wildlife conservation within protected zoo environments. The four-horned antelope or chousingha is not just any species; it is protected under Schedule I of the Indian Wildlife (Protection) Act, amended in 2022. Schedule I provides the highest degree of legal protection, putting it on par with species like tigers and rhinos, due to its vulnerable status.
This tragic event underscores the critical need for stringent safety protocols in zoological parks, especially regarding the storage and use of toxic substances like rodenticides. The death of Schedule I animals is a significant setback for conservation efforts and calls for a thorough review of management practices to ensure such poisoning does not recur.
