In this frosty fact that the basis of the ration of some animals is blood, there is nothing surprising (it is rich in nutrients, especially proteins). And there is nothing strange in the fact that some animals, in particular representatives of the family Culicidae, whom we call mosquitoes, have adapted to extract it.
Thanks to the "bloody diet" female mosquitoes were able to lay their eggs more than once in life, like many other Diptera, but several. A record number of clutches - 12 - was registered in a malarial mosquito. It is no accident that the need for blood is experienced only by female mosquitoes - males are indifferent to it, they suck out nectar and pollen from plants. There are almost no proteins, but enough carbohydrates as an energy source. However, females also go on a vegetarian diet, if there is nowhere to take blood, only in this case they can not lay eggs.
