Gizzard, in many birds, the hind part of the stomach, especially modified for grinding food. Located between the saclike crop and the intestine, the gizzard has a thick muscular wall and may contain small stones, or gastroliths, that function in the mechanical breakdown of seeds and other foods
<span>Young
infants cannot appreciate the carnival game in which a pea seems to
disappear from under a walnut because they have not yet developed a
sense of</span> "Object permanence".
