Coordinated Boa Attacks Are a Horror You Didn’t Know Existed. As twilight descends, nocturnal bat species rouse from their daily resting places to feed, creating spectacular clouds as they pour out of caves en masse. But look closer at Jamaican fruit bat colonies as they emerge from sinkhole caves in Cuba, and you may catch a glimpse of a concurrent macabre ritual: As the bats erupt from the cave, a deadly curtain of Cuban boas hangs in their path, aiming to snatch the winged creatures mid- flight.

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That’s right—these snakes coordinate their attacks, and the result is terrifying. Vladimir Dinets, a research assistant professor at the University of Tennessee, Knoxville, was guiding a bird- and mammal- watching tour through Desembarco del Granma National Park, Cuba, when he first noticed the cavern- hunting snakes. Intrigued by the bold behavior, he decided to take a closer look.

The boas involved could all be found basking near the cave’s entrance during the day, while the bats slumbered in an adjacent chamber separated by a narrow passage. As daylight faded, some of the snakes would move from their warm nooks into the passageway. There, they would dangle their serpentine bodies from the ceiling, ready to strike as bats flew past. Other snakes would take up similar hunting positions as dawn approached, catching the bats as they returned. During each potential feeding opportunity, Dinets dutifully recorded the position of the snakes as well as their hunting success, or lack thereof.“There is an old dogma stating that reptiles are mostly solitary and stupid. My finding is just one of many recent discoveries challenging it.”After 8 days of records, Dinets concluded the snakes coordinated their hunts, and published his results in the Animal Behavior and Cognition.

The first boa would pick its place. Then, when the next slithered up, it would position itself in near the first. And if a third snake joined in, it would hang with the others, too. Dinets considered that the snakes might all just prefer the same areas of the passage, but no snake chose the same segment twice during the entire study, suggesting coordination, not similar taste in locale. And that coordination paid off—boas were significantly more likely to capture a meal if they hunted together. Writer, ecologist, and wildlife photographer Neil Losin and his colleagues have observed a similar strategy among snakes in Puerto Rico.

But he and his team only observed and filmed—they didn’t perform quantitative science to determine if the boas were coordinating their hunting. Watch The Hundred-Foot Journey Download Full. There’s also the famous Cavern of Serpents near the village of Kantenmo, Mexico, where tourists flock to see snakes snatch bats as they exit for the evening. Again, no one has looked closely for coordination. But given the number of examples of this style of cavern feeding, “it is possible that coordinated hunting is not uncommon among snakes,” Dinets said. David Steen, wildlife ecologist at Auburn University Museum of Natural History, took to Facebook to dispute the idea that the boas are coordinating their attacks, arguing that such behavior is difficult to prove without a controlled experiment.

Red Steen’s reaction and Dinets’ responses here. Hundred Season 2 Episode 1 on this page. Christie Wilcox is a science writer, author of Venomous: How Earth’s Deadliest Creatures Mastered Biochemistry, and all around biology nerd. Follow her on Twitter.

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