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Why does some Bats and mosquitos and possibly other animals or insect need blood to survive?

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Why does some Bats and mosquitos and possibly other animals or insect need blood to survive?

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  1. They have become specialized to using blood as their food.  The mouth parts of blood-sucking mosquitoes would not be efficient at consuming other types of foods.  Blood is a good food source because in is high in calories and proteins.  It is also high in salts, which may be important for some of animals which consume blood.   With mosquitoes, it is only the female mosquitoes which suck blood, the male mosquitoes live off flowers.  This is probably related to the high energy needs of producing the eggs.


  2. Leeches as an examples for insects..

    Here is a good site that I found for you:
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