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What is the difference between a polar bears digestive system and a hummingbirds digestive system?
Digestive systems between birds and mammals, no matter what size they are, are completely different. A hummingbird has a much tinier digestive tract than, say, an ostrich or a chicken, but ultimately the same. A polar bear has the same type of digestive system as we humans do.
So, a humming bird's digestive system contains more parts to it than a polar bear's: A crop, gizzard, proventriculum, stomach, two ceca, small and large intestine, and a cloaca at the end. They also have a tiny liver, spleen and pancreas as well. Hummingbirds also lack teeth, only having their beaks and tongue to gather nectar from flowers.
A polar bear, on the other hand, has a simple stomach, small and large intestine, liver, pancreas, spleen, gall bladder, etc.
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What is the relation between the digestive system and the circulatory system?
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What are 5 similarities between human digestive system and frog digestive system?
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