AP BIOLOGY

Detailed explanation-1: -Pangolins lack teeth and grind their food in a gizzard-like structure.

Detailed explanation-2: -The second part of a bird’s stomach (a part we humans don’t have) is the gizzard or muscular stomach. The gizzard is very thick and muscular in some species, such as ducks, gallinaceous birds (those related to chickens such as grouse, quail, and turkeys), emus, and doves.

Detailed explanation-3: -1) The Gizzard Is The Part Of The Chicken That Helps Them Break Down Food. Since chickens do not have teeth, they use abrasive materials like pebbles, grit, and sand, along with enzymes in the gizzard to break down large chunks of food.

Detailed explanation-4: -Summary: Whereas human and many animals use teeth to crush or grind food as an initial part of the digestive process, some species such as birds that lack teeth grind food inside the gizzard–a structure between the mouth and the stomach–with the help of stones.

Detailed explanation-5: -The gizzard is the mechanical stomach of a bird. It is located just after the true or glandular stomach in the gastrointestinal system. Since poultry have no teeth and swallow feed whole, this muscular organ, sometimes called hen’s teeth, mechanically grinds and mixes the bird’s feed.