The coypu on display from the Onyar River near Girona create a great deal of excitement among passersby crossing the city's bridges. They are in greater demand than the classic carp, which has also been cornered by the Ebro thornback, another much more abundant foreign species that can reach comparable sizes. The coypu have found in the lower reaches of the river that runs through Girona, with its calm waters, rich vegetation, and naturalized banks, a perfect ecosystem for reproducing and forming families. They can be seen on the riverbanks or swimming in the water, and they do not flee at the presence of humans.