How Do We Decide Which Primates to Save First?
How Do We Decide Which Primates to Save First?
Imagine having to decide which species should be saved first. Conservation is a science of choices. As threats to wildlife increase, resources like funding, time, and expertise remain limited. Despite the urgency of the biodiversity crisis, conservation operates within real-world constraints; governments have limited budgets, organisations have finite staff and capacity, and ecological problems are often larger than any single project can address. We cannot save everything, at least not at once. This reality forces conservationists to make difficult decisions about where to focus their efforts. Every conservation action carries an opportunity cost: protecting one species, landscape, or ecosystem may mean fewer resources available for another.
One of the hardest questions I’ve been thinking about recently while studying conservation science is this: how do we decide which species to save first?
Among the most complex examples is primate conservation. Primates, our closest relatives, are among the most threatened groups on Earth. According to the IUCN, over 60% of primate species are currently at risk of extinction, and habitat loss, hunting, and climate change continue to accelerate those threats. Many primates inhabit tropical regions undergoing rapid deforestation and agricultural expansion, where pressures from logging, mining, and infrastructure development fragment forests and isolate already small populations. At the same time, hunting for bushmeat and the illegal wildlife trade continue to threaten species that are already struggling to survive.
This raises a challenging question: which primates do we prioritise?
When dozens of species face urgent threats, and conservation resources are limited, prioritisation becomes unavoidable. The challenge is not simply identifying which species are most endangered, but determining where conservation actions can have the greatest and most lasting impact.
Prioritisation is the process of deciding which species, sites, or actions should receive attention when resources are limited. It involves balancing ecological urgency, economic efficiency, and ethical responsibility.
In primate conservation, decisions are guided by scientific frameworks that aim to maximise biodiversity protection. However, the process is not purely scientific; it also reflects social, political, and moral values.
Without prioritisation, funding and resources risk being spread too thin to make a meaningful impact. In practical terms, this might mean choosing between protecting one highly endangered species or safeguarding an entire habitat that supports many species. In practice, this means evaluating where conservation actions can deliver the greatest impact, whether by preventing imminent extinctions, protecting critical habitats, or maintaining ecological processes that support entire ecosystems.
In primate conservation, decisions are guided by scientific frameworks that aim to maximise biodiversity protection. Tools such as the IUCN Red List, spatial conservation planning, and evolutionary distinctiveness metrics help researchers identify species that are most threatened or represent unique branches of evolutionary history. However, the process is not purely scientific; it also reflects social, political, and moral values. Funding priorities, cultural attitudes toward wildlife, and the feasibility of conservation in different regions can all influence which species ultimately receive attention. As a result, prioritisation sits at the intersection of ecology, economics, and ethics.
The most obvious factor is the level of threat a species faces. The IUCN Red List provides a global assessment of extinction risk, categorising species from “Least Concern” to “Critically Endangered.” These assessments are based on quantitative criteria such as population decline, geographic range size, habitat fragmentation, and the probability of extinction over time. By standardising how extinction risk is measured, the Red List allows conservationists to compare species and identify those most urgently in need of intervention.
Species like the Tapanuli orangutan (Pongo tapanuliensis) and Cross River gorilla (Gorilla gorilla diehli) are both critically endangered and exist in extremely small, fragmented populations. Their survival depends on immediate, focused action. With fewer than 800 Tapanuli orangutans remaining and Cross River gorillas numbering only a few hundred individuals, even small disturbances such as habitat loss from infrastructure development or increased hunting pressure can have catastrophic consequences for their long-term survival.
Some species play critical roles in maintaining the structure of ecosystems. Many lemurs and monkeys are keystone species, essential seed dispersers that maintain forest regeneration. Additionally, large-bodied primates can disperse seeds over long distances, helping maintain tree diversity and forest resilience. Without these animals, some plant species struggle to regenerate, gradually altering forest composition and reducing habitat quality for other wildlife.
For example, spider monkeys in Central America disperse the seeds of large rainforest trees that few other animals can transport. When their populations decline, forests can gradually lose these tree species, altering ecosystem structure over time.
Prioritising such species helps conserve not just individuals, but ecological processes that sustain biodiversity at large. In this way, protecting certain primates can create a cascading conservation benefit, safeguarding entire ecosystems rather than a single species.
Some primates represent unique evolutionary lineages. The concept of evolutionary distinctiveness (ED) assigns value to species that have few close relatives, ensuring that evolutionary history is preserved. For example, tarsiers and some lemur species represent millions of years of unique evolution. From an evolutionary perspective, losing one of these species is not simply the loss of a population, but the disappearance of an entire branch of the tree of life.
Frameworks such as the EDGE (Evolutionarily Distinct and Globally Endangered) programme combine evolutionary distinctiveness with extinction risk to identify species that represent disproportionate amounts of evolutionary history. Prioritising these species helps ensure that conservation protects not only biodiversity, but also the deep evolutionary heritage of life on Earth.
Even the most threatened species may not be the most cost-effective to save. Conservation triage, a concept borrowed from emergency medicine, involves directing resources where they can achieve the most measurable success. In practice, conservation organisations must often weigh the likelihood of recovery against the cost of intervention, considering factors such as habitat availability, population viability, and the level of threat facing the species.
For instance, if two species face equal risk but one has a higher chance of recovery with available funding, triage may favour that species. This approach can maximise the number of species saved with limited resources, but it also forces conservationists to confront uncomfortable trade-offs.
While controversial, triage ensures that limited funds are used strategically rather than emotionally.
Conservation success often depends on governance, local engagement, and political stability. Protecting primates in areas with strong local partnerships and existing conservation infrastructure can increase the likelihood of long-term success. Effective law enforcement, supportive environmental policies, and collaboration with local communities all play critical roles in determining whether conservation initiatives succeed or fail.
However, this creates a tension: regions most in need of conservation support often face the greatest social and economic instability. Many of the world’s most threatened primates live in countries experiencing rapid development, land-use conflict, or limited conservation funding. As a result, prioritisation decisions must often balance ecological urgency with the practical realities of working in complex political and socioeconomic landscapes.
Prioritisation is not just scientific; it is inherently moral. Deciding that one species or region deserves attention over another raises ethical questions about human responsibility, fairness, and values. When conservationists allocate funding or focus efforts on particular species, they are not only making ecological decisions but also making implicit judgments about what kinds of life, ecosystems, and futures are most worth protecting.
Intrinsic value: Every species has an inherent right to exist. From this perspective, species should be protected regardless of their usefulness to humans or their ecological role. Many conservation philosophies are rooted in this idea, arguing that biodiversity has value simply because it exists.
Instrumental value: Some species provide ecosystem services that benefit humans and other wildlife. Primates, for example, contribute to forest regeneration through seed dispersal, helping maintain ecosystems that store carbon, regulate climate, and support countless other species. In this view, conservation is justified partly because healthy ecosystems ultimately support human wellbeing.
Cultural value: Primates hold deep cultural and symbolic significance in many societies, from Hindu reverence for Hanuman langurs to the ecotourism value of gorillas and orangutans. These cultural connections can shape conservation priorities, as species that hold social, spiritual, or economic importance often receive greater protection and public support.
A species with immense cultural significance may receive funding even if another species is more endangered, while a highly threatened species may struggle to attract attention if it lacks public visibility. As a result, conservation prioritisation reflects not only ecological realities but also the values and priorities of human societies.
These values often conflict, making prioritisation as much about philosophy as biology.
Conservation cannot succeed without people. For primates, which often live in tropical regions with high human population density, local communities are essential partners. Many primate habitats overlap with agricultural land, villages, and resource-use areas, meaning conservation strategies inevitably interact with the daily lives and livelihoods of the people who live there.
Projects that integrate local livelihoods, such as sustainable forestry, ecotourism, and community-managed reserves, show higher long-term success than those imposed externally. When communities receive tangible benefits from conservation, whether through employment, improved infrastructure, or sustainable income sources, they are more likely to support and actively participate in protecting wildlife.
In Rwanda, community-based tourism linked to mountain gorillas has generated significant local income, demonstrating how conservation and livelihoods can reinforce one another.
Effective prioritisation, therefore, includes social feasibility: supporting species in a way that also benefits the people who share their habitats. Without this balance, even well-designed conservation plans can fail, as local resistance, economic pressures, or land-use conflicts undermine protection efforts. In this sense, successful primate conservation depends not only on ecological knowledge but also on building trust, collaboration, and shared incentives between conservationists and communities.
While prioritisation frameworks like the IUCN Red List and EDGE (Evolutionarily Distinct and Globally Endangered) have advanced the field, they have limitations. These tools provide valuable guidance for identifying species at risk, but they cannot capture the full complexity of ecological systems or the social realities that shape conservation outcomes.
They often focus narrowly on biological data, underrepresenting social and cultural importance. Factors such as local attitudes toward wildlife, traditional ecological knowledge, and cultural relationships with species are rarely incorporated into formal prioritisation frameworks, despite their influence on conservation success.
Data deficiencies mean some lesser-known primates receive little attention simply because they have not been studied. Many species, particularly those living in remote regions or those that are nocturnal and difficult to observe, remain poorly understood. As a result, conservation decisions may unintentionally favour species with better data rather than those most in need of protection.
Funding mechanisms can bias conservation toward charismatic species rather than ecosystem importance. Well-known animals such as great apes often attract disproportionate public attention and financial support. At the same time, less recognisable primates that may play equally important ecological roles struggle to receive adequate conservation funding.
Ethical transparency is essential. Decisions about who and what to save should be open, evidence-based, and reflect global diversity, not just Western funding priorities. Greater transparency in how prioritisation decisions are made can help ensure that conservation strategies are fair, inclusive, and responsive to both ecological and social realities.
To improve prioritisation, we need integrated approaches that balance ecology, ethics, and equity. Conservation challenges rarely exist in isolation, and effective decision-making must account for the complex interactions between species, ecosystems, and the societies that depend on them.
Data-driven frameworks: These should be continuously updated with reliable field data. Advances in monitoring technologies, such as camera traps, satellite imagery, and genetic sampling, now allow researchers to collect more accurate information about population trends, habitat loss, and emerging threats. Integrating these data into prioritisation models can help ensure that conservation strategies reflect current ecological realities rather than outdated assumptions.
Socioeconomic inclusion: Recognising that conservation outcomes depend on human wellbeing. Successful conservation initiatives often align environmental protection with community development, ensuring that local people benefit from the preservation of biodiversity rather than bearing the costs alone.
Global collaboration: Sharing funding, knowledge, and capacity across countries. Because many primate species inhabit regions with limited conservation resources, international cooperation plays a crucial role in supporting research, conservation training, and long-term protection efforts.
Ethical clarity: Being transparent about why some species are prioritised over others. Acknowledging the trade-offs involved in conservation decisions can foster greater trust, accountability, and public understanding of how and why priorities are set.
In primate conservation, this means moving beyond simple “lists” of species and towards holistic strategies that conserve relationships between species, ecosystems, and people. By recognising that biodiversity, human communities, and ecological processes are deeply interconnected, conservation efforts can move toward solutions that are both scientifically effective and socially sustainable.
Prioritisation in primate conservation is both essential and uncomfortable. It asks us to weigh science, ethics, and practicality to decide not only what can be saved, but what should be saved first. In a world where biodiversity loss is accelerating, avoiding these decisions is no longer possible; conservation increasingly requires deliberate choices about where limited resources can have the greatest impact.
While frameworks like IUCN and EDGE guide these decisions, they are only tools. The real challenge lies in using them wisely, with empathy and equity. Numbers and rankings can help organise information, but they cannot replace thoughtful judgment about the ecological, social, and ethical consequences of conservation action.
Saving primates is not just about preserving biodiversity. It is about ensuring that the decisions we make today reflect a future where both people and wildlife can thrive. Protecting primates often means protecting forests, supporting local communities, and maintaining the ecological systems that sustain life far beyond a single species.
The priorities we set reveal the values we hold, and the kind of relationship we hope to build with the natural world.
Because in the end, conservation is not just about what we save, it’s about who we choose to be while saving it.