While grizzly bears and polar bears may have offspring, a grizzly–polar bear hybrid will likely be less suited in either of the ecological roles than the parents themselves.
Aínda que os osos grizzly e os osos polares poden ter descendencia entre eles, un híbrido de oso grizzly e polar probablemente estará peor adaptado en calquera dos papeis ecolóxicos que exercen as propias especies parentais.