Cud stretched, forming a vacuum in the gullet that sucks the semi-liquid stomach content into the esophagus. From the esophagus it is taken back to the mouth with retro peristaltic movements. When the stomach content, or the cud, arrives in the mouth of the ruminant, it is pushed against the palate with the tongue to remove excess liquid, the latter is swallowed and the solid material is chewed thoroughly so the cattle can extract the minerals present in the cud brought to the surface during rumination. The function of rumination is that food is physically refined to expose more surface area
Da Vinci Science Center two dozen hands-on activities that allow visitors to interact with various scientific fields, ranging from seismology to nano technology to animation. All of the exhibits aim to help children view science as playful and interesting. Inspired by a children's book series, this exhibit explores all the qualities of animals that people tend to find disgusting. Visitors who walk through this exhibit learn about the various means of childbirth throughout the animal kingdom and the variety of nutrient sources different species rely on, from cows chewing cud to mosquitoes sucking blood. There's also a section devoted to showing what happens to