Pilpintuwasi combines a butterfly farm with an Amazon animal orphanage near Padre Cocha, reached by boat from Iquitos. The butterfly house is the gentler part of the visit; the rescue centre introduces animals that cannot simply be released after trafficking, injury, or captivity.
It is a good choice if you want wildlife context without pretending that every animal encounter in the Amazon is pristine. Go with a guide or clear transport plan, because the river crossing and local transfers are part of the outing.