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.

July/August 2019

On Target

Researchers strive to make individualized medicine a reality

Marketplace

Sponsored Product Updates

DNASTAR® announced the release of Lasergene 16 Software
DNASTAR® announced the release of Lasergene 16 Software
DNASTAR® announced the release of Lasergene 16 today, which includes a broad range of improvements in for analysis of DNA, RNA and protein sequence data, as well as new advancements for predicting and analyzing protein structures. 
Arbor Biosciences Partners with Curio Genomics for Analysis of IWGSC Wheat Exome
Arbor Biosciences Partners with Curio Genomics for Analysis of IWGSC Wheat Exome
Arbor Biosciences, a division of Chiral Technologies, Inc and worldwide leader in next generation sequencing (NGS) target enrichment, announces a partnership with Curio Genomics for bioinformatics analysis of the wheat genome.
IDT and Washington University join forces to increase access to the latest NGS technologies
IDT and Washington University join forces to increase access to the latest NGS technologies
As part of its commitment to advocate for the genomics age, Integrated DNA Technologies (IDT) aims to lower the barriers to access the latest NGS technologies.
Bio-Rad Launches Bio-Plex Pro Human Immunotherapy Panel 20-plex Multiplex Assay, a targeted tool for researching signaling networks in Immunotherapy Research
Bio-Rad Launches Bio-Plex Pro Human Immunotherapy Panel 20-plex Multiplex Assay, a targeted tool for researching signaling networks in Immunotherapy Research
Bio-Rad Laboratories, Inc. (NYSE: BIO and BIOb) July 15, 2019 announced the launch of its Bio-Plex Pro Human Immunotherapy Panel 20-plex, a multiplex immunoassay that offers a targeted approach for Immunotherapy Research.