Eyelid Squinting During Food-pecking in Pigeons

May 07, 2020 | Biology

Lab.Equipment has your daily Bio industry news covered. Check out this one that first appeared on Journal of Experimental Biology (JEB):

Joachim Ostheim, Julia A. M. Delius, and Juan D. Delius

The visual control of pecking by pigeons (Columba livia) has latterly been thought to be restricted to the fixation stops interrupting their downward head movements because these stops prevent interference by motion blur. Pigeons were also assumed to close their eyes during the final head thrust of the peck. Here we re-examine their pecking motions using high-speed video recordings and supplementary provisions that permitted a three-dimensional spatial analysis of the movement, including measurements of their pupil diameters and eyelid slit width. The results confirm that pigeons do not close their eyes completely during the presumed optically ballistic phase of pecking. Instead their eyelids are narrowed to a slit. The width of this slit is sensitive to both the ambient illumination levels and the visual backgrounds against which seed targets have to be detected and grasped. There is also evidence of some interaction between pupil diameter and eyelid slit width. We surmise that besides being an eye-protecting reflex, the partial covering of the pupil with the eyelids may increase the depth of focus, enabling pigeons to obtain sharp retinal images of peck target items at very close range and during the beak-gape ‘handling’ of food items and occasional grit particles... Continue reading the full article at the Journal of Experimental Biology (JEB) Blog.

In the Biology industry and are in need of reliable Biology lab equipment for your lab? Go through Lab.Equipment’s extensive range of Biology products made by well-established brands like:

Get exceptional Biology equipment available on Lab.Equipment like:

Dealing with other applications? No need to worry. We have you covered. Go though our range of feature-packed lab equipment for veterinary, chemistry, forensics applications and more.

Back To Top
We are fully compliant with the GDPR laws. We promise to safeguard your data and protect your privacy rights.