Page 185 - Ultimate Visual Dictionary (DK)

AMPHIBIANS

EGGS (SPAWN) YOUNG TADPOLES MATURE TADPOLE YOUNG FROG
METAMORPHOSIS OF FROGS
Frogs undergo complete metamorphosis. Eggs
(spawn) are laid in water and hatch into young
tadpoles, which have a tail and external gills Premaxilla SKELETON OF A FROG
but no legs. As the tadpoles grow, the gills
disappear, back legs develop, then front Sphenethmoid Nasal bone
legs, and the tail shrinks. Eventually bone
the tail disappears, resulting in a Maxilla Frontoparietal bone
young adult frog.

Pterygoid bone Prootic bone
Quadratojugal bone
Phalanges
Squamosal bone
Exoccipital bone
Suprascapula
Carpals
Vertebra
Metacarpals
Radio-ulna

Phalanges

Humerus Sacral
vertebra
Metatarsal
Ilium
Distal
tarsals

Femur
Astragalus Urostyle
(tibiale)
Proximal
tarsals Tibiofibula
Calcaneum
(fibulare)

Ischium

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