The Small Behaviours That Shape Survival: Why Welfare Must Be Central to Conservation

By Dr Hannah Trayford

Early in my career, I was told I would eventually have to choose.

Choose between welfare - focused on the individual animal - and conservation - focused on populations, scale, and protection. It was framed as a clean divide: caring for individual orangutans versus saving the species. Sentiment versus science. The implication was clear: welfare was the soft option, something you cared about before you understood the bigger picture.

Years spent inside rehabilitation centres changed my view entirely. Not because I became less interested in individuals, but because I came to understand how directly the wellbeing of each animal shapes the outcomes conservation depends on.  The individual and the species aren't competing priorities. They're the same priority, approached at different scales.

The divide was never real. But it shaped the field in ways that are still visible in how resources are allocated, in which disciplines are considered core and which supplementary. I think we can do better, and I think the evidence shows us how.

A gap in how we think about rehabilitation

The link between chronic stress and physical health is well-established in the scientific literature. Stress suppresses immune function, disrupts appetite, slows healing, and compromises an animal's capacity to learn. What's less established is how consistently this knowledge shapes the day-to-day decisions of rehabilitation practice - and that's the gap welfare science is well-placed to close.

An orangutan who arrives traumatised, orphaned by deforestation, or confiscated after years in the illegal pet trade, may receive excellent veterinary care and adequate nutrition, and still be quietly accumulating the physiological costs of chronic stress. When we can measure welfare alongside physical health - tracking behavioural indicators, individuals interpretation of their own welfare, and treating psychological recovery as a clinical priority - we give those animals a meaningfully better chance.

Rehabilitation centres are doing vital, difficult work, and welfare science is one of the most powerful tools we have to strengthen it. Ensuring it has the resources, the research attention, and the structural place it deserves is an opportunity the field is well-placed to take.

What a young orangutan taught me about challenge

I remember a young male who arrived in good physical condition but was deeply reluctant to climb. It was easy to understand why. He had lost his mother and everything familiar. The canopy wasn't yet a place of safety - it was unfamiliar, unstable, and far from the caregivers he had come to depend on. The branches he was being asked to trust were an unknown quantity. For a young orangutan carrying that kind of loss, hesitation wasn't a problem to be fixed. It was a completely reasonable response to his situation.

The instinct, in those moments, is sometimes to push - to move the animal past the obstacle. Instead, we introduced gradual challenges: slightly higher structures, thicker branches at increasing elevations, space to test stability and learn to read movement at his own pace. He hesitated. He tested every branch before committing. Some days, progress was almost invisible.

Months later, he paused at the edge of a significant gap in the canopy and leapt. He landed cleanly and disappeared into the trees without looking back.

What we were building throughout that process wasn't just confidence - it was the behavioural repertoire and mental resilience he would need to navigate a forest independently. The risk assessment. The physical coordination. The willingness to commit. These capacities don't develop in animals who are kept comfortable and protected from difficulty. They develop through safe challenge, careful observation, and a welfare framework that treats psychological readiness as seriously as physical health.

This is what welfare practice, done well, actually produces. Not sentiment. Survival.

What made that possible wasn't instinct alone. It was a team that had the frameworks, the shared language, and the time to observe carefully and act on what they saw.

Beyond physical recovery

Veterinarians are indispensable to rehabilitation. Their expertise saves lives, prevents disease, and underpins everything we do. Veterinary training is necessarily structured around physical health - and rightly so. But in a rehabilitation setting, where the goal is not just survival but behavioural and psychological readiness for life in the wild, there is real value in building welfare science alongside it.

An orangutan recovering from a significant injury may require sedation, enforced rest, and a period of restricted movement. Medically, this is correct. But this intervention also removes climbing practice, interrupts social learning, and creates a period of enforced passivity that has its own welfare cost - one that may not appear in any physical assessment. Asking what an intervention means for an animal's psychological state and behavioural development, alongside what it means for their physical recovery, opens up richer decisions - not harder ones.

The question shifts from ‘is this animal healthy?’ to ‘is this animal ready?’ - and answering it well requires more than one discipline. The most effective rehabilitation teams I've worked with are those where vets, behavioural specialists, and care staff are genuinely in dialogue - where a behavioural observation from a keeper can shape a clinical decision, and where physical recovery, behaviour, and psychological recovery are tracked alongside each other. Not because any one person is missing something, but because the question itself is bigger than any single expertise.

What the data is already telling us

Post-release monitoring consistently shows that success isn't binary. Some orangutans integrate quickly; others struggle; some are lost within months. When we trace those outcomes backwards, they frequently connect to behaviours visible long before release - hesitation patterns, social confidence, how an animal responded to novel challenges during rehabilitation.

Practice varies across centres, and that variation is instructive. Where welfare science is embedded in rehabilitation, where behavioural signals are systematically collected, interpreted, and fed into decision-making, the data becomes informative in ways it simply can't be otherwise. 

It gives teams the ability to identify animals who need more time, to make release decisions on the basis of readiness, and to build an evidence base that sharpens practice over time. The centres doing this well are demonstrating something important: that welfare assessment isn't additional work layered on top of conservation. It's what makes conservation work better.

Investing in welfare research isn't a concession to sentiment. It's an investment in effectiveness - and the proof is already there in the field, in the outcomes of animals prepared by teams who treat psychological readiness as seriously as physical health.

Building the systems that make this possible

None of this happens without the right people, working well together.

Veterinarians bring clinical expertise that no other discipline can replace. Behavioural scientists can interpret what an animal's choices reveal about their psychological state - the stereotypies that signal poor coping, the exploratory behaviour that signals readiness. Care staff, who spend thousands of hours alongside individual animals, hold knowledge that no formal assessment can fully capture. Rangers and field teams, watching released orangutans navigate the forest, are often the first to see whether the investment of rehabilitation is translating into survival.

These perspectives are most powerful in combination. The strongest outcomes emerge when observation travels through decision-making chains - when a keeper's note reaches a vet, when a field report shapes how enrichment is structured back at the centre, when welfare is woven into the culture of a team rather than sitting within a single role. That kind of integration doesn't happen by accident. It's built deliberately, through shared frameworks, genuine interdisciplinary respect, and organisational commitment to welfare as a discipline, not just a value.

It also requires funding that reflects this understanding. The work of behavioural monitoring, welfare assessment, and post-release follow-up is as consequential as any other element of conservation, and resourcing it accordingly is one of the most practical steps the field can take toward better outcomes.

Welfare is conservation

The divide I was warned about early in my career was a false one - and I think, increasingly, the field knows it. The conversation is shifting. Welfare science is finding its place alongside veterinary care, ecological research, and habitat protection, not as an afterthought but as a discipline in its own right.

Caring for individuals and protecting species are not competing endeavours. The small behaviours we observe every day - a hesitation, a choice, a leap - are not minor details. They are the foundation of survival, and of conservation itself.

We will protect orangutans more effectively when we treat welfare not as an ethical add-on, but as the science it is - rigorous, evidence-based, and central to everything else we do.