Grizzly / Brown Bear Encounter
Do not run. Bear spray at 30 feet. Fight back only if a grizzly makes contact and attacks defensively.
Grizzlies (Ursus arctos horribilis) are the most dangerous bear you will encounter in North America. The majority of attacks are defensive — a surprised mother with cubs or a bear protecting a food cache. Your goal is to de-escalate, not to run. Running triggers pursuit, and you cannot outrun a grizzly.
Do
- Stop, stand your ground, and speak in a calm low voice.
- Make yourself visible — group together, raise arms to appear larger.
- Slowly back away diagonally once the bear shows it knows you are there.
- Ready bear spray at 30 feet and deploy at 20-30 feet if the bear charges.
- If contact is unavoidable during a surprise encounter, play dead: face down, hands over neck, legs spread, pack on.
- If the attack is predatory (uncommon, stalking behavior, attacks at night): fight back hard, target the face.
- Do not run under any circumstances.
- Do not climb a tree — grizzlies can climb.
- Do not make direct prolonged eye contact.
- Do not approach a carcass or a bear on food.
- Do not drop your pack unless you are playing dead.
Black Bear Encounter
Make noise, stand tall, and back away. If a black bear attacks, fight back aggressively.
Black bears (Ursus americanus) are typically less aggressive than grizzlies and are more commonly habituated to humans near campgrounds. Most encounters end with the bear leaving. Unlike grizzlies, if a black bear does attack, it is more likely to be predatory — fight back.
Do
- Stand tall, wave arms, and speak firmly.
- Make noise with pans, whistles, or raised voices.
- Back away slowly and give the bear an exit route.
- Store food in bear canisters or hangs, never in your tent.
- If attacked, fight back — punch the nose, use rocks, sticks, or bear spray.
- Do not play dead with a black bear.
- Do not feed or approach for photos.
- Do not run.
- Do not leave food or scented items unattended.
Mountain Lion / Cougar Encounter
Appear large, maintain eye contact, do not crouch or turn your back.
Mountain lions (Puma concolor) almost never attack adults, but stalking behavior does occur, especially around solo hikers at dawn and dusk. If you see one watching you, the encounter has already been going for a while. Your job is to convince it you are not prey.
Do
- Stop. Face the animal and maintain eye contact.
- Raise arms, open your jacket, or lift gear to appear larger.
- Speak loudly and firmly. Shout if needed.
- Back away slowly. Do not turn your back.
- Pick up children or small dogs immediately.
- If attacked, fight back — target eyes and face with any weapon you have.
- Do not crouch, bend, or make yourself small.
- Do not run.
- Do not turn your back.
- Do not hike alone at dawn or dusk in known cougar country.
Moose Encounter
Moose injure more people in North America than bears. Give them 25+ yards, and hide behind a tree if one charges.
Moose (Alces alces) are large, fast, poor-tempered, and territorial — especially cows with calves in spring and bulls during fall rut. Unlike bears, a charging moose wants you gone, not eaten. A charge is usually a bluff, but not always.
Do
- Maintain at least 25 yards (23 meters) — more during calving or rut.
- Back away slowly if the moose raises ears, lowers head, or licks its lips (stress signals).
- Put a large tree, vehicle, or boulder between you and the moose.
- If charged, run and get something solid between you.
- If knocked down, curl up and protect your head — moose stomp.
- Do not approach a cow with calves.
- Do not stand your ground — unlike bears, moose do not respond to dominance.
- Do not try to outrun one in open ground — they hit 35 mph.
Venomous Snake Encounter
Back away, do not handle, and get to medical care immediately after any envenomation.
North American pit vipers (rattlesnakes, copperheads, cottonmouths) account for nearly all venomous snake encounters in the region. Most bites happen when people try to handle or photograph the snake at close range. Give snakes the right of way.
Do
- Freeze when you hear a rattle, then locate the snake visually.
- Back away slowly, at least 2 body lengths of the snake.
- Use a long lens for photos — minimum 300mm full-frame equivalent.
- If bitten, keep the limb below heart level and immobilize it.
- Remove rings, watches, and tight clothing near the bite site.
- Get to a hospital immediately. Antivenom is the only effective treatment.
- Do not apply a tourniquet, ice, or suction.
- Do not cut the wound.
- Do not try to catch or kill the snake for ID.
- Do not handle any snake for a photo.
Bison Encounter
NPS requires 25 yards. Bison are the most common cause of wildlife injury in Yellowstone. Give them more space than you think you need.
American bison (Bison bison) look docile and are anything but. They can pivot and charge in a fraction of a second, hit 35 mph, and are larger than any predator in the lower 48. Most bison injuries happen because someone stopped for a photo at less than 25 yards. If a bison is walking toward you, it is not asking to pose.
Do
- Maintain at least 25 yards (23 meters) — 100 yards near calves.
- Watch for warning signs: raised tail, pawing, head lowering, snorting.
- If signs appear, back away and get behind a vehicle, tree, or boulder.
- Yield the trail. Bison always have right of way.
- Do not approach for a selfie.
- Do not stand between a bison and its calf.
- Do not block a bison on a trail or boardwalk.
Hypothermia and Cold Exposure
Recognize the umbles — stumbles, mumbles, fumbles, grumbles — and get warm fast.
Hypothermia (core temperature below 95F / 35C) can kill in hours in sub-freezing wind or wet conditions, and in single-digit-C weather if you are wet or wind-exposed. Early symptoms — shivering, slurred speech, clumsiness — signal the narrow window to act. Late-stage hypothermia is a medical emergency.
Do
- Get out of wind and wet clothing. Change into dry layers.
- Insulate from the ground — a pad or pack is critical.
- Feed warm sugary fluids if the person is alert.
- Apply heat to core, armpits, groin — not extremities first.
- If consciousness is altered, treat as a medical emergency and evacuate.
- Do not rub or massage cold skin.
- Do not give alcohol.
- Do not rewarm only the extremities — afterdrop can kill.
Heat Exhaustion and Heat Stroke
Stop, cool, and hydrate at the first sign. Heat stroke is a life-threatening escalation.
Heat exhaustion (heavy sweating, headache, nausea, weakness) becomes heat stroke when the body loses the ability to cool itself. Heat stroke (confusion, cessation of sweating, core above 104F / 40C) is fatal without rapid cooling. Photographers in desert, tropical, or summer exposed locations are at high risk, especially when carrying heavy gear.
Do
- Stop immediately and move to shade or shelter.
- Loosen clothing, remove heavy gear.
- Douse with water, especially neck, armpits, and groin.
- Drink water with electrolytes in small sips.
- If confusion or cessation of sweating — this is heat stroke, evacuate and cool aggressively.
- Do not give caffeine or alcohol.
- Do not ignore early symptoms to get the shot.
- Do not shoot in midday desert sun without shade breaks.
Altitude Sickness
Ascend slowly, descend at the first sign of AMS. HACE and HAPE are fatal.
Acute Mountain Sickness (AMS) starts around 8,000 feet (2,400m) and gets worse with rapid ascent. Mild AMS — headache, nausea, trouble sleeping — is common and usually resolves with rest. High Altitude Cerebral Edema (HACE) and High Altitude Pulmonary Edema (HAPE) are medical emergencies. The only reliable treatment is descent.
Do
- Ascend no more than 1,000 feet (300m) of sleeping elevation per day above 8,000 feet.
- Build rest days into any multi-day high-altitude shoot.
- Hydrate aggressively.
- If AMS worsens, or at any sign of HACE (ataxia, confusion) or HAPE (wet cough, pink sputum), descend immediately.
- Do not ignore symptoms to get the sunrise.
- Do not ascend with alcohol or sleeping pills.
- Do not rely on acetazolamide as a substitute for acclimatization.
Jellyfish and Marine Stings
Vinegar for box jellyfish and Portuguese man-of-war. Seawater rinse for most others. No urine.
Treatment varies by species. Box jellyfish and Portuguese man-of-war (which is technically a siphonophore, not a jellyfish) are the most dangerous and require vinegar. Most other stings respond to seawater rinse, tentacle removal, and hot water. Freshwater and urine can trigger unfired nematocysts and make stings worse.
Do
- Leave the water carefully to avoid further contact.
- For box jellyfish and man-of-war: flood with vinegar for 30 seconds.
- Remove visible tentacles with tweezers or a credit card.
- Soak the area in hot water (110-113F / 43-45C) for 20-40 minutes.
- Seek medical care for severe reactions, facial stings, or systemic symptoms.
- Do not rinse with freshwater.
- Do not use urine.
- Do not rub the sting site.
- Do not apply ice directly to box jellyfish stings.