Speculative evolution giants

Glacier Giant by Sawyer Lee.

Size comparison of a giant ground sloth, glyptodon, and a terror bird.

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The Placental Bird Live-bearing placental birds could be considered the peak of avian reproduction, the first and only bird to completely remove itself from the constraints of the egg completely. Such an adaptation did not appear in a single step, however, but is rather the culmination of many

The Flying Giants With the evolution of the quadrupedal metamorph birds, flying birds have now managed reached sizes unforeseen ever before in their history. Able to use their wings, and not just their hind legs, to aid in launching off the ground, they can grow larger and heavier than strictly