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The part of the alimentary system of a bird where grinding of maize occur is?

The part of the alimentary system of a bird where grinding of maize occur

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5 months ago
the correct answer is gizzard.
detailed explanation;
A typical bird's digestive tract is usually considered to consist of the parts listed at the right. You know what the bill, mouth and tongue are. The pharynx (FAIR-ingx ) is the part between the mouth and the esophagus, much involved with swallowing. The
esophagus is the tube leading down from the pharynx.
Not present in all birds, the crop serves more or less as a "doggy bag" when the bird eats. Notice the crop in the picture above. Let's say you're a Song Sparrow and you discover a weed just loaded with delicious-looking seeds, but the weed grows in the open. If you flit into the open area to eat the weed's seeds, you're making yourself vulnerable to predators who want to eat you. What to do?
What you do is to flit into the open and gobble up those seeds far faster than any stomach could possibly handle them, then fly to safety. You can do this because of your crop. For, as you cram in those seeds, a few at first go straight to the gut but, when that fills, further seeds begin detouring to the bag-like crop. Once the crop is full of seed, you fly to your favorite perch, and now there's not much to do but let your stomach digest. As those first seeds in the stomach begin working their way through the rest of the body, seeds stored in the crop automatically refill the stomach. If someday you pick up a bird, perhaps one that has flown into a window and you want to save it from the cat, if that bird has recently eaten, you well may be able to feel the crop in the chest area, feeling like a bag filled with grit right below the feathers.
Actually, specialists in the field of bird guts would want to insist that some birds have real crops, other birds have "pseudocrops," and that there are other croplike variations, but we don't want to get too confused so we'll just leave it at that.
The proventriculus:
The stomach is an amazing affair consisting of two chambers . The proventriculus is the first chamber. It secretes an acid for breaking down food, and is best developed in birds that swallow entire fish and other animals containing bones which must be digested. If you know a little chemistry, you'll know how amazing it is that bird stomach-acid can have a pH as low as 0.2. In most of North America there's a kind of bird known as a shrike, which eats small animals, especially rodents and songbirds. A shrike's well developed first stomach-chamber can digest an entire mouse in only three hours!
The gizzard:
The bird stomach's second chamber is known as the gizzard. If you've ever eaten a chicken gizzard you know how tough and rubbery it is. To accomplish what the gizzard does, it absolutely must be tough, for the gizzard's main function is to grind and digest tough food. Though the gizzard consists of very powerful muscles, it alone can't pulverize everything the typical bird eats; you know how hard uncooked rice and corn kernels are, and these aren't even considered hard types of grain.
5 months ago
Answer is Gizzard.
The second stomach chamber of a bird is known as the gizzard. The gizzard's main function is to grind and digest tough food. The first chamber is the proventriculus.
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