The reason why mosquitoes need blood is simple: blood is a very protein rich substance that the adult female mosquitoes need in order to produce eggs.
Therefore, mosquitoes need a blood meal from a host in order to reproduce. The protein rich nutrition of blood is required for the production of their eggs, which are also very high in protein content.
The diet of male mosquitoes and female mosquitoes who are not seeking to reproduce is composed of sugary substances such as the nectar of flowers and plants, which provide the mosquitoes with a quick metabolizing energy source.
In contrast, it takes the female mosquito 2 to 3 days to fully digest a blood meal and use the energy derived from it in order to produce her eggs.
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