Whole-carcass feeding study finds welfare gains for zoo lions
Bottom line
Zoo-housed African lions at Monarto Safari Park spent longer feeding, showed post-meal rest patterns, and shifted their activity in ways that more closely resembled wild feeding ecology after keepers introduced whole animal carcasses on a feast-and-fast schedule, according to a new University of Adelaide-led study published in Applied Animal Behaviour Science. The researchers used 24-hour video monitoring over three months and found that changing not just the nutrient profile, but the form and timing of food delivery, altered behavior in three adult male lions. The paper adds fresh evidence to a small but growing body of zoo welfare research suggesting that whole-carcass feeding can promote species-typical behavior in large carnivores. (digital.library.adelaide.edu.au)
Why it matters: For veterinary and animal care teams, the study reinforces that feeding protocols are a welfare tool, not just a nutrition decision. External experts and zoo nutrition programs have increasingly emphasized that carcass feeding can support oral health, digestive function, muscle use, and social feeding behavior, while earlier lion studies have linked gorge-and-fast schedules and carcass feeding with lower pacing and higher activity. For clinicians and welfare-focused zoo professionals, that means diet presentation, feeding frequency, and behavioral monitoring may deserve more attention in routine management plans alongside body condition, dental health, and safety protocols. (nationalzoo.si.edu)
What to watch: Whether larger, multi-institution studies confirm these findings, and how zoos balance welfare gains with carcass sourcing, biosecurity, visitor communication, and operational constraints. (nationalzoo.si.edu)
A new study from the University of Adelaide and Monarto Safari Park suggests that feeding zoo-housed African lions whole animal carcasses on a feast-and-fast schedule can bring their daily behavior closer to what is seen in the wild. Published in August 2026 in Applied Animal Behaviour Science, the study tracked three adult male lions with 24-hour video monitoring over three months and found longer feeding bouts, post-feeding rest cycles, and activity patterns that better matched natural lion feeding ecology after the feeding change was introduced. (digital.library.adelaide.edu.au)
That matters because captive lion welfare has long been shaped by a tension between nutritional precision and behavioral realism. Traditional zoo diets often rely on butchered meat delivered on predictable schedules, which can meet nutrient needs but may not fully engage the feeding behaviors lions evolved to perform. The new paper builds on earlier work showing that more naturalistic feeding schedules can improve activity and reduce some unwanted behaviors. A 2005 study on captive lions found that switching to a gorge-and-fast schedule increased active appetitive behaviors and reduced pacing on fast days, while a longitudinal Chester Zoo case study reported reduced pacing and longer feeding times after a move to whole-carcass feeding with fast days. (czaw.org)
In the Monarto study, researchers examined how a whole-carcass routine changed behavior in a small group of zoo-housed African lions at a large safari park setting. According to the article record and University of Adelaide research profile, the paper is titled “Effects of implementing a whole-carcass feeding routine on the behaviour of zoo-housed African lions (Panthera leo)” and appeared in volume 301 of Applied Animal Behaviour Science as article 107041. The source material describes the intervention as a whole-carcass, feast-and-fast routine, and reports that the lions’ behavior shifted toward extended feeding periods and post-meal inactivity patterns more consistent with wild conspecifics. (digital.library.adelaide.edu.au)
The broader zoo field has been moving in this direction, although implementation varies. Smithsonian’s National Zoo says carcass feeding is used to support physical, mental, and social health, noting benefits for oral and digestive health, muscle tone, and natural social feeding behavior in carnivores. Auckland Zoo likewise frames carcass feeding as both welfare enrichment and a visitor education issue, highlighting the need for approved suppliers, health and safety protocols, and advance signage for guests. A 2026 Frontiers in Veterinary Science review also underscored that welfare is shaped not only by what animals are fed, but by the form and function of food delivery. (nationalzoo.si.edu)
Direct outside commentary on this specific lion paper was limited in the sources reviewed, but the surrounding expert literature points in a consistent direction: naturalistic diet presentation can produce measurable behavioral effects, and those effects are increasingly being treated as evidence-based welfare outcomes rather than optional enrichment. At the same time, experts caution that naturalistic feeding items can be nutritionally variable, which means welfare gains have to be balanced with careful ration formulation, sourcing standards, and ongoing health assessment. (frontiersin.org)
Why it matters: For veterinary professionals, this study is a reminder that welfare-centered nutrition goes beyond calories, protein, and micronutrients. Feeding format can influence activity budgets, oral engagement, digestion, social dynamics, and stereotypic behavior, all of which intersect with preventive medicine and quality-of-life assessment. For zoo veterinarians and clinical nutrition teams, the practical question is whether carcass feeding protocols can be integrated safely and consistently into broader care plans, with attention to body condition, dental wear, GI tolerance, pathogen control, enclosure logistics, and staff safety. The findings may also support more structured behavioral monitoring before and after diet changes, so welfare claims can be measured rather than assumed. (nationalzoo.si.edu)
What to watch: The next step is likely replication at larger scale, across more animals, sexes, ages, and institutions, as well as closer study of operational tradeoffs such as carcass sourcing, visitor-facing communication, and standardization of welfare metrics. If follow-up work confirms the Monarto findings, whole-carcass feeding may gain traction as a more formal component of zoo carnivore welfare protocols rather than remaining a discretionary enrichment strategy. (sciencedirect.com)