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Keywords:

  • Archaeopteryx;
  • allometry;
  • Jurassic Aves;
  • Compsognathus.

The size (mass) of Archaeopteryx, primarily the Berlin specimen, has been estimated in two ways. A new three-dimensional reconstruction suggests a mass of no more than 271 g. Application of allometric equations derived from both birds and mammals to various linear dimensions yields a range of estimates from 112 to 2269 g, but all the more plausible estimates lie in the range 220–330 g.