First Image: “English: Pacific chorus frog (P. regilla) with parasite-induced (Ribeiroia ondatrae) limb malformation.” (2011) by Brett A. Goodman, Pieter T. J. Johnson, CC BY 2.5.

Second image: “Trematode cyst-infected Pacific Treefrog (Hyla regilla) with supernumerary limbs, from La Pine, Deschutes County, Oregon, 1998-9. This ‘category I’ deformity (polymelia) is believed to be caused by the trematode cyst infection. The cartilage is stained blue and calcified bones in red. Front detail view of the frog against light grey background.” – source description.

Uploaded by Mrjohncummings(Wikimedia Commons User). Credit to Science Museum, CC BY-SA 2.0.