Discover Herpetotheres cachinnans: The Bird That Inspired Folklore
Meet the Laughing Falcon
The Laughing Falcon (Herpetotheres cachinnans), known as “Guaco” in Spanish, is a remarkable bird of prey specialized in hunting snakes—even venomous ones! With its iconic haunting call (resembling loud, mocking laughter), this raptor controls snake populations and has inspired ancient myths and natural remedies across Latin America.
📹 Proof of Its Hunting Skills!
Don’t miss this stunning footage captured by local guide Aaron Ugalde, showing a Laughing Falcon devouring a venomous fer-de-lance snake (Bothrops asper)—one of Costa Rica’s most dangerous serpents.
“Video courtesy of Aaron Ugalde, local wildlife expert”
🔍 Key Facts About the Laughing Falcon
✅ Diet: Specializes in snakes, including venomous species like the fer-de-lance.
✅ Vocalization: Its loud “wah-cooo, wah-cooo!” call gave it the Spanish name “Guaco” and is believed to warn of nearby snakes.
✅ Habitat: Tropical forests from Mexico to Argentina.
✅ Folklore: Costa Rica’s cry is considered a natural warning sign.


🌿 The “Guaco” Vine: Myth or Science?
A popular legend suggests the Laughing Falcon rubs a vine called “guaco” (Mikania glomerata) on its body to become immune to snake venom. While this isn’t scientifically proven, the plant does have medicinal properties:
- Traditional use: Brewed as an antidote and natural snake repellent.
- Science: Contains anti-inflammatory and venom-neutralizing compounds.

✨ Local Insight: In areas like Arenal, guides like Aaron Ugalde have documented the falcon’s role in natural snake control.