Is there a difference though? A snake is a vehicle for delivering poison, which is a chemical compound disrupting your biological machinery. A mosquito is a vehicle for delivering pieces of biological machinery that disrupt your own biological machinery.
The snake kills in the same way the mosquito does. The snake's poison kills in the same way malaria parasites do. Both statements are true, they're just operating on different abstraction levels.
> A snake is a vehicle for delivering poison, which is a chemical compound disrupting your biological machinery.
The poison is the snake's own weapon and defence, not a hitch-hiker, and poison delivery is part of a snake's normal bite process (if the snake is poisonous).
> A mosquito is a vehicle for delivering pieces of biological machinery that disrupt your own biological machinery.
No, the mosquito itself delivers some saliva and draws blood, that somebody else takes advantage of this can hardly be ascribed to the mosquito's fault. Again, compare to other reservoirs, or to a dog giving you rabies. The dog didn't kill you, rabies did, the dog was the unwitting carrier of the infection rabies is not a weaponised dog secretion.
The snake kills in the same way the mosquito does. The snake's poison kills in the same way malaria parasites do. Both statements are true, they're just operating on different abstraction levels.