zsl-edge-of-existence:The eastern hellbender has gills when it is in its larval form, but develops l
zsl-edge-of-existence:The eastern hellbender has gills when it is in its larval form, but develops lungs as it metamorphoses into an adult. However, it spends so much time in the water and absorbs so much oxygen through its skin (which has so many folds to maximise oxygen absorption) that it hardly uses its lungs at all. In fact, one hellbender survived and lived a healthy life after its lungs were surgically removed. -- source link