Search results
Results from the WOW.Com Content Network
The preorbital gland is a paired exocrine gland found in many species of artiodactyls, which is homologous to the lacrimal gland found in humans. These glands are trenchlike slits of dark blue to black, nearly bare skin extending from the medial canthus of each eye.
To study behavioral responses of toads to varying types of stimuli, Ewert conducted experiments by placing the toad in the center of a small cylindrical glass vessel. He then rotated a small stripe (bar) of contrasting cardboard (acting as a visual 'dummy') around the vessel to mimic either prey-like or threat-like stimuli; see Video. The rate ...
Generally mammals, birds and reptiles living in air vary their eyes' optical power by subtly and precisely changing the shape of the elastic lens using the ciliary body. The small difference in refractive index between water and the hydrated cornea means fish and amphibians need to bend the light more using the internal structures of the eye.
Animal pupils are sometimes vertical - it would appear that this is the same as a number of small pulis stacked on top of each other. This would give more light and the same sensitivity to movements/prey moving horizontally. If there is a predator that has a horizontal pupil than one could expect it's prey to move vertically.
With the building out of the way, the Goat Shelter can hold up to 12 Prized Goats, regardless of type (e.g. you could store a Prized Red Goat alongside a Prized Pygmy Goat). Each individual animal ...
When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. To look at a nearby object, the eyes rotate 'towards each other' ( convergence ), while for an object farther away they rotate 'away from each other' ( divergence ).
The sheep have a dark, horizontal rectangle in the middle of their eyes and this is their pupil. Here we will examine why sheep have rectangular pupils and how this impacts their vision. Sheep ...
In humans, the pupil is circular, but its shape varies between species; some cats, reptiles, and foxes have vertical slit pupils, goats and sheep have horizontally oriented pupils, and some catfish have annular types. [3] In optical terms, the anatomical pupil is the eye's aperture and the iris is the aperture stop.