Urutu

Famous for its cross-shaped markings and extremely painful, necrotic bites. Found in southern Brazil, Argentina, and Paraguay.

FamilyViperidae

GenusBothrops

RegionSouth AmericaSouthern South America

Photo: Cláudio Timm · Source: Wikimedia Commons · License: CC BY-SA 2.0

Urutu

Photo: Cláudio Timm · Source: Wikimedia Commons · License: CC BY-SA 2.0

Urutu

Danger Score

Final Danger Score

Venom Core

Lethality weighted 55% (potency × yield). Clinical weighted 45% (real-world CFR).

0.55 × 50 + 0.45 × 5250.9

Modifiers

Multiplicative scalers - amplify or reduce existing danger, can't create it from nothing.

× Speed (1.01)51.4

× Delivery (1.00)51.4

× Encounter (0.86)44.2

Speed = antivenom window. Delivery = fang efficiency. Encounter = exposure × temperament.

Score44

Venom Profile

Type

HemotoxicTargets blood and circulatory system; disrupts clotting and can cause bleeding disorders.,CytotoxicDestroys cells and damages tissue; can cause permanent tissue damage and disfigurement.

Venom Yield

High

Venom Speed

Quick

Potency (SC Equivalent)

3.900mg/kg LD50

Max Dry Yield

150mg dry

Clinical Severity

Fatality (Untreated)

5-15%

WHO Importance

Cat. 1

Local Effects

Pain at bite site, Swelling, Blistering, Tissue damage, Severe limb swelling and pressure

Blood

Coagulopathy, Internal bleeding

Causes of Death

Massive internal bleeding