Brown spider 8–40 mm with characteristic violin marking. Considered the most dangerous of all recluse spiders worldwide — 'araña de rincón' in Chile.

Cytotoxic venom causes severe necrotic skin lesions ('loxoscelism') that can spread for weeks. Visceral form attacks kidneys — mortality 3–5% in such cases. Hundreds of bites annually in Chile, Peru.

Inside houses across Chile, Peru, Argentina, Uruguay, southern Brazil — behind paintings, in closets, woodpiles, beds.

Reclusive, nocturnal. Bites only when pressed — often in bedding, while dressing, or while moving stored items.

Glossy black with red hourglass — South American counterpart of the North American black widow. Found across Argentine Pampas, Uruguay, southern Brazil.

Alpha-latrotoxin causes severe muscle cramps, hypertension, sweating. About 1,000 bites per year reported in Argentina alone. Antivenom is widely available and very effective.

Grasslands and pampas of Argentina, Uruguay, southern Brazil, Paraguay. Also found in agricultural areas, woodpiles.

Builds messy tangle webs near the ground. Female bites only when pressed — typically in fields, while harvesting, or while moving objects.

Largest small cat in the world — up to 100 kg, body 2.5 m including tail. Can leap 5 m vertically and 12 m horizontally. Most widespread big cat in the Americas.

Attacks on humans are rare but documented — about 1 fatal attack every 2 years in North America. Targets joggers, cyclists, and children. Strikes from behind.

Mountains, forests, deserts from Canadian Rockies to Patagonia. Wide range of habitats.

Solitary, crepuscular, silent. Doesn't roar — emits eerie screams during mating. Stalks prey for hours.

Up to 6 m and 1,900 kg. Pacific population concentrates around northern California (Farallon Islands) and Mexico's Guadalupe Island.

Most fatal unprovoked shark attacks worldwide. About 5–10 fatalities per year globally. Mistakes surfers for seals — the 'investigative bite' is often fatal.

Cool coastal waters of California, Oregon, Washington, Mexico (Pacific), northeastern US, Atlantic Canada.

Apex predator. Migrates thousands of km. Breaches fully out of water when attacking seals.

Stocky, aggressive shark up to 3.5 m. Uniquely tolerant of fresh water — found in Mississippi, Amazon, even Lake Nicaragua.

Top contender for most dangerous shark to humans. Hunts in shallow, murky water — exactly where people swim. Many attacks attributed to 'great whites' are actually bull sharks.

Shallow coastal waters, estuaries, rivers — Florida, Gulf of Mexico, Caribbean (Cuba, Bahamas, DR), Lake Nicaragua, Mississippi River, Pacific coasts of Mexico and Central America.

Aggressive and territorial. Tolerates salinity from 0 to 53 ppt. Attacks unprovoked more than other sharks.

Disc up to 1.5 m with whip-like tail bearing a serrated venomous spine. Common in Gulf of Mexico and Caribbean — popular with tourists at 'Stingray City'.

Stings only defensively when stepped on. Spine drives deep, often breaks off. Steve Irwin's death is a textbook example of chest impalement.

Sandy and muddy bottoms of Gulf of Mexico, Caribbean, southeastern US Atlantic coast.

Buries in sand. The 'stingray shuffle' (sliding feet) prevents most stings. Eats clams, shrimp.

Largest dolphin — up to 9 m and 6 tons. Apex predator of the oceans. Since 2020, a pod off Iberia has been deliberately ramming and sinking sailboats.

No fatal attacks on humans in the wild ever recorded — but as of 2024, over 700 boat ramming incidents and 4 sailboats sunk off Spain and Portugal. Direct human risk: drowning during shipwreck.

All European waters — Atlantic, Bay of Biscay, Mediterranean (rare), Norwegian Sea, North Sea. Iberian pod active off Spain, Portugal.

Highly intelligent, social — pods of 5-30. Teach each other behaviours culturally. The boat-ramming is being learned by new generations.