Digestive Anatomy Comparision of Both Birds

Digestive Anatomy

Digestive tract for Chickens *Not sufficient data for Toucan, therefore used another omnivorous bird's GI tract

Digestive tract for Chickens *Not sufficient data for Toco Toucan, therefore used another omnivorous bird’s GI tract – Stevens & Humes (1998)

Digestive Tract for Carnivorous bird of prey

Digestive Tract for Carnivorous bird of prey *Not sufficient data for Harpy Eagles, used another raptor GI tract- Steven & Humes (1998)

 

 

 

 

 

 

 

 

 

 

 

 

Birds have several modifications for flight, which includes the absence of teeth, decreased weight of the jaw skeleton and muscles, acquisition of a gizzard as an organ and limitations in gut capacity.27

Since Toco Toucans and chickens are omnivorous birds, they have a similar gastrointestinal tract. Toco Toucans have an enlarged crop and a larger more muscular gizzard compared carnivorous birds. The enlarged crop allows better storage for food and the more muscular gizzard allows better grinding food.13

Since the Red-Tailed Hawk and the Harpy Eagle are both carnivorous birds of prey (Accipitriformes) they have a similar gastrointestinal tract. They have a much smaller ceca, or nonexistent, since they don’t need to ferment any coarse materials such as plants. The small intestine is much shorter and slightly coiled in carnivorous birds of prey where they are much longer and highly coiled in omnivorous birds.13

vulture gizzard

Murray (2014)

 

Oral cavities of birds contain few mucus and taste buds, and their esophagus carries their food ino the stomach through peristalsis. The avian stomach is split into two, the proventriculus and the gizzard. The proventriculus is in charge of releasing pepsin which breaks down proteins (important for Harpy Eagle) while the gizzard is in charge of physically grinding the food.13

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