Menu

Pupil Alignment of Predators and Prey

Ambush predators are more likely to have vertical slit pupils, while foraging animals tend to have horizontal ones, a study shows.

Aug 11, 2015
Amanda B. Keener

PIXABAY, SABINCHEN

Slit-shaped pupils help animals adjust their eyes to see clearly day or night, but that attribute doesn’t explain why some animals have horizontal slit pupils and others have vertical ones. A study published last week (August 7) in Science Advances suggested that pupil orientation is related to an animal’s eating or hunting habits.

“People had been saying that the horizontal pupil helps expand the horizontal view of the ground, they just hadn’t shown that,” study coauthor Martin Banks of the University of California, Berkeley, told The New York Times. “Our contribution was to build a model and show that that happened.”

Banks and his colleagues analyzed the eyes of 214 land animal species and found that those with slit pupils roughly fell into two groups: vegetarian animals that tended to have horizontal pupils and ambush predators that hunt close to the ground, which tended to have vertical pupils. Large predators, like big cats and predators that chase their prey, on the other hand, tend to have round pupils, Popular Science reported.

Using computer simulations, the researchers observed that when the pupil is horizontal, more light enters the eye from the side than from above or below, which, they concluded, may be useful for keeping watch for predators. They determined that a vertical pupil would facilitate depth perception and focus.

“There are so many exceptions to the rules the authors think to have discovered, that there must be much more to pupil shape than being predator or prey, big or small,” Ronald Kröger, a biologist from Lunds University in Germany told The New York Times.

Banks told Science News that the hypothesis represents just one force of many on the evolution of vision.

November 2018

Intelligent Science

Wrapping our heads around human smarts

Marketplace

Sponsored Product Updates

Slice® Safety Cutters for Lab Work

Slice® Safety Cutters for Lab Work

Slice cutting tools—which feature our patent-pending safety blades—meet many lab-specific requirements. Our scalpels and craft knives are well suited for delicate work, and our utility knives are good for general use.

The Lab of the Future: Alinity Poised to Reinvent Clinical Diagnostic Testing and Help Improve Healthcare

The Lab of the Future: Alinity Poised to Reinvent Clinical Diagnostic Testing and Help Improve Healthcare

Every minute counts when waiting for accurate diagnostic test results to guide critical care decisions, making today's clinical lab more important than ever. In fact, nearly 70 percent of critical care decisions are driven by a diagnostic test.

LGC announces new, integrated, global portfolio brand, Biosearch Technologies, representing genomic tools for mission critical customer applications

LGC announces new, integrated, global portfolio brand, Biosearch Technologies, representing genomic tools for mission critical customer applications

LGC’s Genomics division announced it is transforming its branding under LGC, Biosearch Technologies, a unified portfolio brand integrating optimised genomic analysis technologies and tools to accelerate scientific outcomes.