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Birds diversified in a wide variety of ways during the Cretaceous period . Many groups retained their primitive features , such as clawed wings, and teeth, although teeth were lost independently in some groups of birds, including modern birds . While the earliest forms, such as Archeopteryx and Jeholornis , retained the long bony tails of their ancestors, the tails of more advanced birds became shorter with the appearance of the pygostyle bone in the clade Pygostylia .
Printed on A4 paper
38 x34 cm
Happy Valentine's Day
Birds diversified in a wide variety of ways during the Cretaceous period . Many groups retained their primitive features , such as clawed wings, and teeth, although teeth were lost independently in some groups of birds, including modern birds . While the earliest forms, such as Archeopteryx and Jeholornis , retained the long bony tails of their ancestors, the tails of more advanced birds became shorter with the appearance of the pygostyle bone in the clade Pygostylia .
Printed on A4 paper
38 x34 cm
Happy Valentine's Day
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