A naturalist is someone who studies the natural world through direct observation, spending time in fields, forests, and waterways to understand how plants, animals, and ecosystems work together. The term applies to both professionals employed by parks and conservation organizations and passionate amateurs who document wildlife in their backyards. What connects all naturalists, past and present, is a commitment to learning about nature firsthand rather than primarily through laboratory experiments.
What a Naturalist Actually Does
The core of naturalist work is observation. Where a lab biologist might study a species by analyzing its DNA under a microscope, a naturalist watches that species in its habitat, recording its behavior, diet, seasonal patterns, and interactions with other organisms. The primary tools are surprisingly simple: field notebooks, binoculars, magnifying lenses, cameras, and printed field guides for identifying species. Many naturalists today also use apps like iNaturalist and eBird to log and share what they find.
Professional naturalists typically spend about 70% of their working time outdoors and 30% in an office. Their daily responsibilities vary widely. A county park naturalist, for example, might lead school groups on interpretive hikes in the morning, maintain a butterfly garden in the afternoon, and spend the evening writing a newsletter or updating social media pages. Others conduct species inventories across managed lands, create trail signage, coordinate community events, or even appear on local radio programs to promote environmental awareness. The thread running through all of it is translating the natural world for a broader audience.
How Naturalists Differ From Biologists and Ecologists
The boundaries between these careers overlap, but the emphasis is different. Naturalists focus on species interactions and evolutionary relationships through fieldwork. Ecologists study ecosystems at a systems level, looking at energy flow and nutrient cycling, and split their time roughly evenly between the field and the lab. Wildlife biologists zero in on animal populations and habitat management. Conservation scientists lean heavily toward policy, spending most of their time in offices working on land management and resource protection.
What sets naturalists apart most clearly is their generalist perspective. A wildlife biologist might specialize in elk populations in a single watershed. A naturalist working the same area would be tracking the birds, the wildflowers, the insects, the soil conditions, and how they all relate to one another. This breadth is the naturalist’s defining strength.
Famous Naturalists Who Shaped Science
Before modern biology split into dozens of specialized disciplines, nearly every scientist studying living things was called a naturalist. Charles Darwin is the most famous example. His decades of meticulous observation, from Galápagos finches to barnacles to earthworms, produced the theory of evolution by natural selection. But Darwin was part of a long tradition.
John Ray, a 17th-century English naturalist, established the concept of species as the fundamental unit of classification, a framework biologists still use. Jan Swammerdam, a Dutch naturalist and microscopist, was the first person to observe and describe red blood cells in 1658. Pierre Belon, working in France, made systematic comparisons between bird and human skeletons that laid the groundwork for comparative anatomy. Louis Agassiz, a Swiss-born naturalist who later moved to the United States, revolutionized our understanding of glaciers and extinct fish. James Hutton, a Scottish naturalist and geologist, originated uniformitarianism, the principle that the Earth’s features can be explained by gradual, ongoing natural processes rather than sudden catastrophes.
These figures shared a common approach: careful, patient observation of the natural world, followed by attempts to find patterns and principles within what they saw.
How to Become a Naturalist
There are two paths, professional and volunteer, and both are well-established.
For a professional career, most positions require at least a bachelor’s degree in biological science. Federal agencies like the U.S. Forest Service hire entry-level naturalists and wildlife biologists at relatively junior pay grades, with promotions after about two years of training. Their qualification requirements are specific: at least 9 semester hours in wildlife subjects like mammalogy or ornithology, 12 hours in zoology, and 9 hours in botany or plant sciences. A common stumbling block is that general biology majors often lack enough coursework in wildlife and plant science to qualify. A graduate degree in natural resources management or environmental policy can also open doors.
For those who want to practice naturalism without making it a full-time career, certified naturalist programs exist in many states. California’s program, run through the University of California, requires a 40-plus-hour course combining classroom instruction, field experience, science communication training, and community service. Texas, Virginia, and many other states run similar Master Naturalist programs. These certifications train volunteers to assist with conservation projects, lead nature walks, and contribute to scientific monitoring efforts.
Citizen Naturalists and Modern Technology
You don’t need a degree or certification to be a naturalist. Millions of people contribute meaningful scientific data simply by photographing plants and animals and uploading their observations to online platforms. iNaturalist, the largest of these, had reached approximately 110 million observations as of mid-2022. eBird serves a similar function specifically for bird sightings. These platforms use community verification, where experienced users help confirm identifications, turning casual nature walks into real biodiversity data.
Organized events called BioBlitzes bring citizen naturalists together to document as many species as possible in a defined area over a short period. A 2022 BioBlitz focused on Portuguese flora, for instance, involved 323 observers who recorded over 6,500 observations covering nearly 1,200 plant species. This kind of distributed data collection would be impossible with professional researchers alone, and it feeds directly into global biodiversity databases used by scientists and policymakers.
Ethics in Naturalist Work
Responsible naturalism prioritizes observation over collection. When specimens must be gathered for research, professional guidelines call for taking material from fewer than 10% of individuals in a rare plant population, with even smaller proportions from sparse populations. Whole plants are rarely removed. Researchers minimize the number of site visits to reduce trampling and accidental damage to surrounding species, and they take care not to disturb soil in ways that could invite invasive plants.
For everyday naturalists, the ethical principles are straightforward: watch without interfering, stay on trails when possible, avoid handling wildlife, and leave habitats as you found them. The naturalist’s goal has always been to understand the natural world, not to alter it.