Question

furculum, synsacrum, pygostylr are the characteristics of

Answer 1

These are the characteristics of birds
Pygostyle : (in a bird) a triangular plate formed of the fused caudal vertebrae, typically supporting the tail feathers.
Furculum : The furcula ("little fork" in Latin) or wishbone is a forked bone found in birds and some dinosaurs, and is formed by the fusion of the two clavicles.
Synsacrum : an elongated composite sacrum containing a number of fused vertebrae, present in birds and some extinct reptiles.