Whether or not the remains of such a creature have been found, or ever will be found, is still a matter of debate.
Technological development is also an evolutionary process.
The transition between one era and another can sometimes be symbolized by the introduction of a single product. Boeing's P-26 was a milestone in three respects. To placate conservative elements in the Air Corps, however, the P-26's designers were constrained to include several anachronistic features in the airplane that hampered its development potential. The Peashooter was also to be the last fighter aircraft mass-produced by Boeing before the company went on to bigger things, in both the figurative and the literal sense. The company that would later become Boeing Aviation was founded in 1916 by William Edward Boeing.