Architects.
Building dams is a threat to fish because it takes away from their habitat and breeding grounds. Dams may also hinder their ability to migrate.
building houses or dams
beaver
dams
they route it differently
Building dams
The animal known for building dams and lodges in rivers and streams by eating wood is the beaver.
yea how to biuld
the govt.
flooding
The Chinese have built dams to prevent flooding.
By building dams - for example, the construction of the Aswan Dam in the 1960's meant that from 1970 the annual flood was controlled.