Even as India celebrates a rise in its tiger population, a new national assessment has flagged an emerging conservation challenge: some of the prey species that sustain these big cats — chital (spotted deer), sambar (large deer), and the vulnerable gaur (Indian bison) — are declining across key tiger landscapes in east-central India, particularly in Odisha, Jharkhand and Chhattisgarh.
These findings come from a first-of-its-kind assessment of ungulates (hoofed mammals) conducted by the Wildlife Institute of India (WII) and the National Tiger Conservation Authority (NTCA), using data from India’s 2022 tiger census.
Ungulates form the bulk of a tiger’s diet and are also critical to the forest ecosystem. Yet, across tiger habitats in these regions, they are facing increasing pressure from loss of habitat due to deforestation, development, agricultural expansion, urbanisation, human-wildlife conflict, and subsistence hunting.
The report points to the broader consequences, drawing a direct link between low prey numbers and human-wildlife conflict. “High bushmeat consumption and civil unrest in the region negatively impact wildlife presence, leading to low ungulate densities,” the report notes on Odisha. “Palamau (in Jharkhand), an important part of the Central Indian corridor, faces challenges such as Left Wing Extremism, which affects wildlife presence,” it says.
To revive prey populations, the report recommends on-site breeding of chital and sambar in secure enclosures designed to keep out predators.
However, even as eastern and central Indian states are seeing prey depletion, several other landscapes show healthier trends. The Shivalik Hills and Gangetic plains — from Uttarakhand and Uttar Pradesh to eastern Bihar — as well as tiger reserves in Madhya Pradesh and Maharashtra have a stable prey base. In the Western Ghats, chital, sambar, wild pigs, gaur and barking deer are widely distributed, while the hog deer and wild pigs dominate in the Northeast.
The report Status of Ungulates in Tiger Habitats of India is based on field data from the 2022 tiger estimation, supplemented with data from the 2018 and 2014 cycles. While ungulates have been mapped in each cycle, this is the first time their data has been analysed and published separately. Unlike tigers, whose individual numbers are tracked, prey estimation focused on mapping the density of chital and sambar. For other ungulates, scientists estimated where these animals are found and how many there might be, based on direct and indirect evidence such as field surveys, dung trails, and camera trap images.
India is home to over 3,600 wild tigers — about 70% of the global population — and their survival depends heavily on prey such as chital, sambar and gaur. Other species in their diet include nilgai, wild pigs, hog deer, barking deer and chinkara. Leopards, wild dogs, jackals and hyenas also rely on the same prey base.
“The quality of forests within 40 per cent of tiger reserves — and outside them — is low. These assessments (of ungulates) are crucial as we have to look beyond the numbers (of tigers). These are measurable biodiversity indicators and can guide us on how to address forest quality on a large scale,” said Qamar Qureshi, wildlife biologist and co-author of the report.
According to the report, a density of 30 ungulates per square km can support four tigers in 100 square km. Tiger numbers may rise with prey density, but plateau at about 75 ungulates per sq km due to ecological constraints such as territoriality, competition and lack of habitat connectivity.
Among the tiger reserves, Pench in Madhya Pradesh has one of the highest chital densities — nearly 54 per sq km.
“Maintaining quality habitat and reducing pressures on the prey base is crucial. We are working with WII to improve prey density,” said Gobind Sagar Bharadwaj, Additional Director General of Forests (Project Tiger) and NTCA Member Secretary.
The report draws a link between low prey numbers and human-wildlife conflict. In areas like Tadoba (Maharashtra) and Ratapani (Madhya Pradesh), tigers are attacking livestock due to the lack of natural prey, sparking conflict with local communities.
The report also identifies strongholds of prey abundance. Chital populations were found thriving across clusters like Rajaji-Corbett-Ramnagar-Pilibhit-Dudhwa (Uttarakhand and Uttar Pradesh), Kanha-Pench-Achanakmar (Madhya Pradesh, Maharashtra, and Chhattisgarh), Bandhavgarh-Sanjay Dubri-Veerangana Durgawati (Madhya Pradesh), and the Nagarhole-Bandipur-BRT-Wayanad-Mudumalai-Sathyamangalam landscape (Karnataka, Kerala and ). These clusters span diverse forest types — from the Terai-Duar savannas to the moist deciduous forests of Central and Southern India.
Nikhil joined The Indian Express in 2024. Originally from Mumbai, he has worked in publications such as Tehelka, Hindustan Times, DNA Newspaper, News18 and Indiaspend. In the past 14 years, he has written on a range of subjects such as sports, current affairs, civic issues, city centric environment news, central government policies and politics.
