 The western subspecies of the giant eland is critically endangered, the only remaining known population being in the Niokolo-Koba National Park; the rapid decline in numbers of this antelope has been attributed to poaching.Other mammals found in the country include the green monkey, the Guinean gerbil and the Senegal one-striped grass mouse.Some 674 species of bird had been recorded in Senegal by April 2019.