The federal government is moving to protect a frog population in Quebec that has been the subject of a two-year legal battle.

Environment Minister Catherine McKenna says the Western Chorus Frog on the South Shore needs an emergency protection order.

McKenna says her officials will talk to those involved to determine the scope of the emergency order for the frog population in La Prairie.

The announcement represents a victory for the environmental groups that have been fighting for a protection order since 2013 to halt the construction of a housing development they say threatens La Prairie's frog population.

The Western Chorus Frog is olive or brown-coloured and grows to a length of about 2.5 cm.

It breeds in wetlands, which are threatened by urban development and agriculture.

Although the species is "globally secure," the frog has been listed as threatened in Canada since 2010.