At Wildlife SOS, our mission is to rescue, rehabilitate, and conserve India’s wildlife, with our pioneering project focussing on sloth bears (Melursus ursinus). These magnificent creatures, once forced into cruel ‘dancing’ performances, now find a safe haven in four of our rescue centres, one of them being the Agra Bear Rescue Facility (ABRF). But caring for them goes beyond providing food and shelter. Rescuing sloth bears has given Wildlife SOS the magnificent opportunity to closely understand this largely understudied species. And monitoring their health and behaviour has led to yet another groundbreaking research conducted.
Urinalysis plays a crucial role in understanding a sloth bear’s health, from metabolic function to stress and reproductive status. [Photo © Wildlife SOS/ Kunal Malhotra]
We’re excited to share a study titled “Non-invasive urine collection-floor pit method in captive sloth bears (Melursus ursinus)” on field veterinary research that was recently published. It introduces an effective and stress-free method to collect urine samples from rescued sloth bears under our care at ABRF. Urine analysis has allowed Wildlife SOS to gain valuable insights into their metabolic conditions, reproductive status, and stress levels without any invasive procedures.
Why urine matters, and how it was collected
Understanding the reproductive health and metabolic conditions of sloth bears in rehabilitation have been challenging topics to study. Repeated blood collection for hormonal analysis is extremely difficult in wildlife species such as sloth bears. That’s why urine plays an important role.
A sloth bear’s daily routine, from feeding to movement, plays a key role in physiological processes, making timely and stress-free sample collection essential for accurate urinalysis and overall health assessment. [Photo © Wildlife SOS/ Shresatha Pachori]
Monitoring urine chemistry and analysis plays a crucial role in understanding:
- Metabolic conditions that affect overall health
- Reproductive status and hormonal cycles
- Stress physiology and animal welfare
In bears, changes in the levels of hormones, proteins or other compounds in urine can tell us if the animal is healthy, stressed, or suffering from certain metabolic issues. However, obtaining urine from large wild mammals like sloth bears in a non-stressful way was a challenge. Many traditional methods require anaesthesia or physical restraint, which can be risky and stressful for both the animal and our team.
This paved the path to develop a collecting technique that was non-invasive as well as effective for analysis. A simple ‘floor pit’ was made inside every bear’s enclosure, an area that is familiar and non-stressful for them. The pits were formed as a space on the ground where urine would flow into, making a clean sample easy to collect without disturbing the bear.
The yellow arrows in image (a) and (b) indicate the shallow floor pits made next to the gates of indoor enclosures. [Photo © Wildlife SOS]
The minimal disruption setup proved to be cost-effective and was made using readily available materials. The approach is completely non-invasive, meaning:
- Zero stress to the animals during collection
- No human intervention is required during the actual urination process
- Natural behaviour remains undisturbed
Regular monitoring of their health using this technique therefore becomes feasible throughout the year.
The Floor Pit Innovation
Creating a floor pit involved slight modifications in the bears’ enclosures that leveraged their natural behaviours. The team set up the following in order to collect the sample:
- A small, shallow and safely accessible pit (approximately ~45 cm length, ~2 cm width, and ~1.5 cm depth) was dug and lined with smooth, non-porous material like concrete to prevent absorption and ensure easy cleaning. Urine would drain into this pit through the force of gravity.
- Before use, the pit and surrounding floor were cleaned and disinfected, air-dried, and wiped with sterile cotton to ensure samples wouldn’t get contaminated.
- The best time to collect urine was decided to be after the bears’ morning feeding. The sample was collected directly via a sterile syringe from the pit, and transferred immediately into an airtight screw-cap vial. This was then either analysed immediately (with test strips and UA analyser) or frozen at –20 °C for later analysis.
The main takeaway was that the floor-pit method worked perfectly. It provided clean, usable urine samples without physically handling the animals, and thus is a viable process to assess the following physiological aspects of rehabilitated sloth bears.
A urine sample can be collected with a syringe and can be stored in a labelled air-tight vial. [Photo © Wildlife SOS]
Advantages of Collecting Floor Pit Urine
- Standard urinalysis parameters like colour, clarity, sedimentation, pH, leucocyte presence, protein, glucose, ketone bodies, bilirubin, and blood cells, are used to determine metabolic conditions.
- Basic biological data (haematology, biochemistry, urology) for sloth bears is still quite scarce, and so, this innovative method is proving to benefit analytical studies.
- Studies on the reproductive physiology of sloth bears, including the timing and duration of oestrous cycles, have historically been extremely limited. One of the most significant applications of this method has been in monitoring reproductive hormones in female sloth bears. Hormonal monitoring via this method promises to fill critical knowledge gaps about sloth bear reproduction, which has direct implications for conservation efforts.
Broader Implications for Conservation
The sloth bear (Melursus ursinus) is classified as Vulnerable on the IUCN Red List and faces numerous threats across the Indian subcontinent. Despite their wide distribution across India, Sri Lanka, Nepal, Bhutan, and Bangladesh, comprehensive data about their biology remains limited.
Wildlife SOS aims to tackle health challenges for sloth bears without causing them any stress, keeping the safety of sloth bears and the medical team in mind, which is why careful, non-invasive monitoring methods are apt and extremely helpful. [Photo © Wildlife SOS/ Hemant Chakma]
The non-invasive floor pit method represents a shift toward humane, ethical wildlife management. By avoiding sedation and restraint, we reduce health risks and allow for more frequent sampling, leading to better-informed decisions on diet and treatment. The data generated through this method contributes to the broader scientific understanding of sloth bear biology, answering questions that have existed for decades.
The method also adds to improved and better welfare standards, as by eliminating the need for invasive procedures, new standards are being set for animal welfare in captive wildlife management. The floor pit method is developed for settings where rehabilitated animals are safeguarded, but the principles behind this could give birth to future monitoring techniques for wild populations and their conservation.
Looking Ahead: The Wildlife SOS Difference
This research exemplifies Wildlife SOS’s holistic approach to wildlife conservation. We don’t just rescue and rehabilitate animals, but also actively contribute to the scientific understanding that can help protect entire species. At the Agra Bear Rescue Facility (ABRF), every aspect of the sloth bears’ environment is designed with their well-being in mind. The floor pit method is one example of how thoughtful design and scientific research can work together to benefit our rescued bears.
Even in semi-natural enclosures, maintaining minimal human interference allows sloth bears to behave instinctively, ensuring that biological samples reflect true health conditions rather than stress-induced ones. [Photo © Wildlife SOS/ Hemant Chakma]
As we continue this important work, we’re excited about the possibilities that lie ahead. Each urine sample collected brings us closer to understanding the intricate nature of their biology. And each day, we’re reminded that innovation in animal care doesn’t always require complex technology. Sometimes, it just requires looking at old problems in new ways!
By supporting Wildlife SOS’s bear-rescue programmes, you help make it possible for us to invest in things like improved enclosure design, veterinary monitoring, and research collaborations. Consider donating to Wildlife SOS to help fund more research and rescues.
Read the research report here.
Feature Image: Hemant Chakma/ Wildlife SOS
