A typical roundworm measures roughly 2.7% of the average length of a Bengal tiger or weighs just three-millionths of one percent of the largest of the world’s big cats. Though these parasites do not pose a major threat to Bengal tigers (Panthera tigris), researchers across South Asia, the cat’s native range, warn that parasitic infections can act as silent killers, particularly when the big cats are weakened by poor nutrition, injury or other diseases. South Asia is home to roughly 4,367 Bengal tigers: 3,682 in India, 429 in Nepal, 131 in Bhutan and 125 in Bangladesh, according to the latest estimates. The IUCN lists the Bengal tiger as an endangered species, although it is classified as critically endangered in Bangladesh. Bangladeshi researchers, analyzing fecal samples collected from wildlife across the Sundarbans mangrove forest, detected the highest parasite infection rate in Bengal tigers. A study published by the Bangladesh Forest Department in July makes recommendations to address the issue. Sultan Ahmed, a professor in the Department of Microbiology and Immunology at Sylhet Agricultural University and one of the authors of the study, told Mongabay, “The most important recommendation is to keep the mangrove forest away from human interference.” Assigned by the Forest Department, the researchers collected fecal samples in two phases in 2024 and 2025. According to their analysis, the highest parasite infection rate, 85.3%, was detected in Bengal tigers, followed by 84.9% in rhesus monkeys (Macaca mulatta), 73.6% in deer and 66.7% in wild pigs. In molecular analysis, roundworms (including…This article was originally published on Mongabay

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