Ways of getting rid of mosquitoes: fill in wetland (upper left); dredge irrigation ditches (upper right); remove weeds (lower left); fill in trees (lower middle); empty leftovers into the (waste) pot (lower right).

Eating food contaminated by flies may result in fever, cholera, dysentery.

Cleaning and using herb to kill flies.

Catching fly larva from cesspool and killing larva in cesspool with hot water.

People cleaning the river; larva eaten by duck, frog, and fish.

Cleaning the house, animal pens, burning trash, to get rid of mosquitoes.

Hanging net installed to catch mosquitoes.

Killing pupa in soil.

Life cycle of flies.

How much rice a sparrow can eat in a day and a year to explain why sparrow is one of the "four pests."