Sometimes their over all shell can differ, very much like people and fingerprints. Other times it can be because they have been misidentified, this sadly is very common.
They are imported in bulk an other species find their way into a consignment.
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black belly piranahs are born with there black bellies
Western fence lizards usually do have blue bellies, and are sometimes called 'blue-bellied lizards'
The red-bellied black snake, which is native to eastern Australia, is black with a distinctive pink-red belly.
As they get older the tend to get more dark gray to a black with some silver spots. The red on their bellies changes to white though if they are not in light for awhile
bellies
The star is typically portrayed as gold or yellow in color on the bellies of the Sneetches in Dr. Seuss' story.
Clydies are commonly bay, but can allso be black, brown, grey, roan and chestnut. Clydesdales almost always have broad, white markings on their faces and legs, and often splashes of white on their bellies.
Fireflies make their bellies glow by combining certain chemicals that make a "glow" in their bellies. This glow is used to communicate to other fireflies.
For example, in the first stanza he uses an ABAB rhyme scheme, “Now, the Star-Bellied Sneetches had bellies with stars. The Plain-Belly Sneetches had none upon thars. Those stars weren't so big.
Whales keep air, and thus oxygen, in their lungs, not in their bellies
The plural of stomach is stomachs.
Popcorn and Cinnamon