Fish Scales

Red: Ctenoid

Blue: Cycloid

Green: Ganoid

Yellow: Placoid

Frog Skin

Red: Blood Vessel

Blue: Poison Gland

Green: Chromatophore

Yellow: Mucus Glands

Purple: Epidermis

Feather parts

Red: Vane

Blue: Rachis

Green: Barb, Barbules

Yellow: Calamus

Bird skin has: stratum basale and stratum corneum

Mammal Skin Layers

Red: stratum corneum

Blue: stratum grandulosum

Green: stratum lucidum

Yellow: stratum spinosum

Purple: stratum basale

Dermis

Orange: Papillary Dermis

Light Blue: Reticular Dermis

Purple: Hair Follicles

Yellow: Hair root

Dark Blue: Arrector pilli muscles

Red: Sebaceous glands (oil)

Green: Sudoriferous glands (Sweat)

Black: pressure receptor