A unique characteristic of the Surinam toad has been uncovered by scientists in California. Despite its unusual appearance and limited vision, this toad has a remarkable ability to detect and capture prey swiftly in the murky waters of the Amazon basin. Researchers have discovered that the toad can essentially “see” with its fingertips, using them to sense the subtle movements of nearby prey.
In a recent study, led by Duncan Leitch, a neurobiologist at the University of California, Los Angeles, it was revealed that the star-fingered toad employs its highly sensitive fingertip lobes to detect the size and proximity of potential prey. These lobes, akin to a human eye’s fovea, can process signals from neurons and allow the toad to suck in its prey without direct contact, even in darkness.
The researchers found that each frog’s fingertips contain 128 tiny lobes with an abundance of dome-shaped bumps called papillae, which enhance touch sensitivity. Despite making up only a small portion of the frog’s skin, these lobes house the majority of touch-sensitive nerves on its front legs. Furthermore, the toad’s brain dedicates a significant amount of resources to processing sensory information from its fingertips, a phenomenon similar to that seen in more complex mammal brains.
Lea Randall from the Wilder Institute in Calgary emphasized the significance of this discovery, highlighting how frogs, despite their less developed brains compared to mammals, have evolved a similar strategy to process sensory information effectively. This finding sheds light on how vertebrates, even lower vertebrates like amphibians, have adapted over millions of years to optimize sensory capabilities.