One person asked if, because of their abundance in Dublin, there was any good in flies or mosquitoes. ‘Abdu’l-Bahá answered, saying: … “The same benefit that you have given to the world, the mosquito has. You say the mosquito harms and sucks the human blood; but you kill animals and eat them. Therefore, you are more harmful than the mosquito.
(Earl Redman, ‘Abdu’l-Bahá in Their Midst, p. 157)