The only paired cutaneous sebaceous gland in birds, located in the rump region above the free caudal vertebrae; its secretion serves to oil the plumage.
Condition caused by restricted nutrient intake; leads to weight loss, reduced pr...
The upper boundary of the thermoneutral zone; when ambient temperature rises abo...
Animals that excrete mainly urea as the end product of nitrogen metabolism.
A narrow muscular tube conveying urine from the kidneys to the middle section of...
Animals that excrete mainly uric acid as the end product of nitrogen metabolism.
Excretion of the kidneys.