which served to stiffen the torso during flight, and provide a stable support for the shoulder blade. Likewise, the sacral vertebrae could form a single synsacrum while the pelvic bones fused also.

Size

Pterosaurs were highly diverse in size, and some were the largest flying organisms in earth's history. Early pterosaurs of the Triassic and Jurassic periods were typically small animals with wingspans

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