Only female mosquitoes require the blood of humans and other animals for the development of their eggs properly before they are laid. Male mosquitoes feed on fruits and plant juices.
When the female mosquito takes blood, she injects an anticoagulant to keep the blood from clotting. The anticoagulant, like all foreign proteins, activates the immune system. This causes a local allergic reaction around the bite. Since these bites can bring malaria and other diseases, we have evolved to react to the bite by itching.
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