The university-run Musea de Historia Natural houses a motley collection of stuffed local animals and birds and a few other dusty items, including over 150 snakes from Parque Nacional Manu and various Amazon biodiversity projects. The entrance is hidden off the Plaza de Armas, to the right of the church of La Compañía de Jesús. But if you can't find it, don't worry: you're not missing much.