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

In English

Författare

  • 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.

Publiceringsår

2016-01-25

Språk

Engelska

Sidor

125-128

Publikation/Tidskrift/Serie

Physiology & Behavior

Volym

157

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Zoology

Nyckelord

  • operant conditioning

Status

Published

Forskningsgrupp

  • Lund Vision Group

ISBN/ISSN/Övrigt

  • ISSN: 1873-507X