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History
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Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555)
Pierre Belon systematically compared the skeletons of birds and humans in his Book of Birds (1555)
The front wings of beetles have evolved into elytra, hard wing-cases.
The front wings of beetles have evolved into elytra, hard wing-cases.
Dragonflies have the ancient insect body plan with two pairs of wings.
Dragonflies have the ancient insect body plan with two pairs of wings.
The hind wings of Dipteran flies such as this cranefly have evolved divergently to form small club-like halteres.
The hind wings of Dipteran flies such as this cranefly have evolved divergently to form small club-like halteres.
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Tetrapod
Tetrapod
Eusthenopteron, ≈385 Ma
Eusthenopteron, ≈385 Ma
Tiktaalik, ≈375 Ma
Tiktaalik, ≈375 Ma
Acanthostega, ≈365 Ma
Acanthostega, ≈365 Ma