Ultra-Rapid Vision in Birds

PLoS One. 2016 Mar 18;11(3):e0151099. doi: 10.1371/journal.pone.0151099. eCollection 2016.

Abstract

Flying animals need to accurately detect, identify and track fast-moving objects and these behavioral requirements are likely to strongly select for abilities to resolve visual detail in time. However, evidence of highly elevated temporal acuity relative to non-flying animals has so far been confined to insects while it has been missing in birds. With behavioral experiments on three wild passerine species, blue tits, collared and pied flycatchers, we demonstrate temporal acuities of vision far exceeding predictions based on the sizes and metabolic rates of these birds. This implies a history of strong natural selection on temporal resolution. These birds can resolve alternating light-dark cycles at up to 145 Hz (average: 129, 127 and 137, respectively), which is ca. 50 Hz over the highest frequency shown in any other vertebrate. We argue that rapid vision should confer a selective advantage in many bird species that are ecologically similar to the three species examined in our study. Thus, rapid vision may be a more typical avian trait than the famously sharp vision found in birds of prey.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Raptors / physiology*
  • Vision, Ocular / physiology*

Grants and funding

Financial support was provided by Carl Trygger’s Foundation (grant numbers CTS 09: 425 and CTS10: 432, to AÖ; URL: http://www.carltryggersstiftelse.se), The Swedish Research Council Formas (grant number 22-2007-729, to AÖ; URL: http://www.formas.se) and The Swedish Research Council (grant number 621-2012-3722, to AQ; URL: http://www.vr.se). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.