Table 1.

List of extant and fossil specimens and techniques

Type	Class	Species name	Common name/museum no.	Technique
Extant	Amphibia	Xenopus laevis	African clawed frog	1,2,3,4,5
Extant	Amphibia	Hymenochirus boettgerii	Dwarf African clawed frog	2,3,4,5
Extant	Amphibia	Cynops orientalis	Fire-bellied newt	2,4,5
Extant	Reptilia	Basiliscus basiliscus	Brown basilisk	2,4,5
Extant	Reptilia	Ctenosaura similis	Black iguana	1,2,4,5
Extant	Reptilia	Eublepharis macularius	Leopard gecko	1,2,3,4,5
Extant	Reptilia	Anolis carolinensis	Green anole	2,3,4,5
Extant	Aves	Taeniopygia guttata	Zebra finch	2,3,4,5
Extant	Aves	Lonchura oryzivora	Java sparrow	2,4,5
Extant	Aves	Scolopax rusticola	Woodcock	1,2,3,4,5
Extant	Aves	Troglodytes troglodytes	European wren	1
Extant	Mammalia	Mus musculus	Brown mouse	1,2,3,4,5
Extant	Mammalia	Oryctolagus cuniculus	European rabbit	1,2,4,5
Extant	Mammalia	Sus scrofa	Domestic pig	1,2,3,4,5
Extant	Mammalia	Ovis aries	Domestic sheep	1,2,4,5
Fossil	Amphibia	Pelophylax pueyoi	NHML-R4999	4,5
Fossil	Amphibia	Pelophylax pueyoi	NHML-R4982	4,5
Fossil	Reptilia	Reptilia indet.	HMLDMe9018	4,5
Fossil	Mammalia	Chiroptera indet.	HMLDMe7069	4,5

1, alkaline hydrogen peroxide oxidation; 2, enzymatic melanin extraction; 3, histology; 4, scanning electron microscopy; 5, synchrotron rapid scanning X-ray fluorescence analysis.