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Home NEWS Science News

A bird’s blind spot plays an important role in its vision

Bioengineer by Bioengineer
March 29, 2017
in Science News
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Credit: Tyrrell et al (2017)

The width of a bird's visual binocular field is partially determined by the size of the blind area in front of its head, according to a study published March 29, 2017 in the open-access journal PLOS ONE by Luke Tyrrell and Esteban Fernández-Juricic from Purdue University, USA.

Like many vertebrates, a bird's eyes are located on the sides of its head. This eye placement is thought to have several functions, such as increased depth perception and greater visual coverage, however, little is known about the purpose of the blind area in front of a bird's head.

To investigate what role the blind area may play in bird vision, the authors of the present study examined published data on the visual fields of 40 species of birds and measured the beaks and skulls of museum specimens.

The researchers found that birds with longer beaks had larger blind areas in front of their heads and thus, narrower fields of binocular vision. Surprisingly, these longer-beaked birds also had reduced blind gaps in front of their heads compared to birds with shorter beaks. This finding suggests that the size of the blind area and the visibility of the beak play an important role in birds' vision.

"The evolution of binocular vision in birds appears to be driven, in part, by a blind area in front of the head," says Luke Tyrrell.

###

In your coverage please use this URL to provide access to the freely available article in PLOS ONE: http://journals.plos.org/plosone/articleid=10.1371/journal.pone.0173235

Citation: Tyrrell LP, Fernández-Juricic E (2017) Avian binocular vision: It's not just about what birds can see, it's also about what they can't. PLoS ONE 12(3): e0173235. doi:10.1371/journal.pone.0173235

Funding: This study was funded by the National Science Foundation (IOS Award#1146986 to EFJ), http://www.nsf.gov/div/index.jsp?div=IOS. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interests: The authors have declared that no competing interests exist.

Media Contact

Tessa Gregory
[email protected]

http://www.plos.org

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Story Source: Materials provided by Scienmag

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