 He gives a vivid and accurate description of the last colony of the European beaver in Wales on the River Teifi, but spoils it by repeating the legend that beavers castrate themselves to avoid danger.Likewise he gives a good description of an osprey fishing, but adds the mythical detail that the bird has one webbed foot.His description of Irish wildlife has been the subject of much adverse comment for its inaccuracies and lapses into fiction but nonetheless, despite its faults, it gives an important glimpse of Irish fauna in the 1180s.