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

Potier, Simon LU ; Bonadonna, Francesco; Kelber, Almut LU and Duriez, Olivier (2016) In Physiology & Behavior 157. p.125-128
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
operant conditioning
in
Physiology & Behavior
volume
157
pages
125 - 128
publisher
Elsevier
external identifiers
  • pmid:26821187
  • scopus:84960457813
  • wos:000372943000018
ISSN
1873-507X
DOI
10.1016/j.physbeh.2016.01.032
language
English
LU publication?
yes
id
e037faff-68b6-430c-85db-b6f1588f869a (old id 8573071)
date added to LUP
2016-02-16 16:08:06
date last changed
2017-06-20 10:34:02
@article{e037faff-68b6-430c-85db-b6f1588f869a,
  abstract     = {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.},
  author       = {Potier, Simon and Bonadonna, Francesco and Kelber, Almut and Duriez, Olivier},
  issn         = {1873-507X},
  keyword      = {operant conditioning},
  language     = {eng},
  month        = {01},
  pages        = {125--128},
  publisher    = {Elsevier},
  series       = {Physiology & Behavior},
  title        = {Visual acuity in an opportunistic raptor, the chimango caracara (Milvago chimango)},
  url          = {http://dx.doi.org/10.1016/j.physbeh.2016.01.032},
  volume       = {157},
  year         = {2016},
}