In the forests of Thailand and China, a tiny predator is rewriting what we know about insect intelligence. Meet Pahabengkakia piliceps, a little-known species of assassin bug that has now joined the elite ranks of tool-using animals—and it does so with deadly precision.
Scientists have discovered that these clever bugs don’t just rely on stealth or speed to catch their prey. Instead, they wield sticky resin like a weapon, turning the bees’ defense system against them. It’s the ultimate ambush tactic.
Researchers from Xishuangbanna Tropical Botanical Garden in China first became intrigued by the bugs’ hunting behavior in 2021. Perched silently at the entrance of stingless bee hives, P. piliceps seemed to have an uncanny success rate. When scientists recorded the scenes, they noticed something strange: before pouncing, the assassin bugs smeared a shiny substance on their front legs.
This sticky substance was resin, left by the bees themselves to ward off ants and other intruders. But instead of avoiding it, the assassin bugs scraped it off the hive, crushed it into smaller pieces, and applied it to their legs.
Here’s where it gets even more cunning: breaking the resin releases a cloud of chemicals that tricks the bees into thinking there’s a threat at the hive entrance. The bees rush over to defend the colony, only to fly straight into the clutches of a hungry assassin bug.
Watch this YouTube video below to see how assassin bugs smear their legs with the resin that stingless bees lay around their hives to trap intruders, and then trap the stingless bees themselves.
“They’re not using the resin as it is.… They’re manipulating it,” said Fernando Soley, a behavioral ecologist at the Western Australia Museum who wasn’t involved in the research. That subtle shift, from using the material to modifying it, puts P. piliceps in rare company among tool-using animals.
While many assassin bugs are known to use sticky plant substances to snare prey, this species has elevated the trick to a new level. It’s not just using a trap—it’s setting the bait.
Still, this isn’t brainy behavior in the way we think of chimps cracking nuts by using stones like a hammer and anvil, or crows crafting hooks to catch prey. According to study co-author Li Tian, an entomologist at China Agricultural University, the bugs don’t seem to be making conscious decisions. “They have the impulse to put resin on their front legs,” he explains, even when no bees are nearby.
That automatic action suggests the behavior may be hardwired, an inherited instinct rather than a learned skill. But that’s what makes it so interesting. “It’s like being born with a skill without knowing what it’s for,” Soley adds.
Studying such simple yet sophisticated behaviors in insects could help scientists better understand how more complex tool use evolved in animals, and maybe even in us. For now, one thing’s clear: nature still has plenty of surprises hidden in the hive when it comes to cunning survival strategies.
For more details, refer to this article published in Biology Letters.
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