The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Visual acuity in an opportunistic raptor, the chimango caracara (Milvago chimango)

På svenska

Author

  • Simon Potier
  • Francesco Bonadonna
  • Almut Kelber
  • Olivier Duriez

Summary, in English

Raptors are always considered to have an extraordinary resolving power of their eyes (high visual acuity). Nevertheless, raptors differ in their diet and foraging tactics, which could lead to large differences in visual acuity. The visual acuity of an opportunist bird of prey, the Chimango caracara (Mivalgo chimango) was estimated by operant conditioning. Three birds were trained to discriminate two stimuli, a positive grey uniform pattern and a negative grating pattern stimulus. The visual acuity range from 15.08 to 39.83 cycles/degrees. When compared to other birds, they have a higher visual acuity than non-raptorial birds, but they have the lowest visual acuity found in bird of prey so far. We discuss this result in the context of the ecology of the bird, with special focus on it is foraging tactic.

Publishing year

2016-01-25

Language

English

Pages

125-128

Publication/Series

Physiology & Behavior

Volume

157

Document type

Journal article

Publisher

Elsevier

Topic

  • Zoology

Keywords

  • operant conditioning

Status

Published

Research group

  • Lund Vision Group

ISBN/ISSN/Other

  • ISSN: 1873-507X