External Anatomy
Which has spurs on their feet: Hens or Roosters
Roosters
What is the Crop?
pouch-like expansion of the esophagus serves as a temporary storage site, allowing the bird to consume large amounts of feed quickly before softening it for later digestion.
Like mammals, chickens have a heart consisting of this many chambers, allowing for the complete separation of oxygenated and deoxygenated blood.
4
What are Wattles?
Located just below the beak, these dual fleshy lobes are more prominent in roosters and, like the comb, aid in thermoregulation by circulating blood.
What is the Gizzard?
Because chickens lack teeth, they use this muscular organ, often containing grit or small stones, to mechanically grind their food.
Because of their high metabolic rate and small body size, a resting chicken’s heart rate typically falls within this rapid beats-per-minute range.
250 - 350 bpm
What is the Shank?
On a chicken’s leg, this is the area located between the hock joint and the foot; in many breeds, its color can indicate the bird's laying productivity.
What is the Proventriculus?
Unlike the muscular gizzard, this "true stomach" or glandular stomach is where chemical digestion begins through the secretion of hydrochloric acid and pepsin.
This is the primary structural difference between avian and mammalian red blood cells; unlike ours, a chicken's erythrocytes contain this organelle.
A nucleus
What are the Primary Feathers?
Found on the wing, these long, stiff feathers are the largest of the flight feathers and are numbered 1 through 10 during a molt evaluation.
What are the Ceca?
Found at the junction of the small and large intestines, these two "blind pouches" are the primary site for microbial fermentation of fibrous materials.
In a major anatomical distinction from mammals, the avian aorta curves to this side of the body as it leaves the heart.
The right
What is the Uropygial Gland?
This specialized gland, located at the base of the tail, secretes an oil that birds use to waterproof and condition their feathers during preening.
What is the Cloaca?
This common chamber serves as the exit point for the digestive, urinary, and reproductive systems, where fecal matter and white uric acid crystals are combined.
This condition, common in fast-growing broilers, occurs when the right ventricle fails due to high pulmonary blood pressure, leading to fluid accumulation in the abdomen.
Ascites