It is believed that as a result of exaptation, or making previously "useless" DNA into DNA that could be used in order to increase survival chance, mammals were able to generate new brain structures as well as behavior to better survive the mass extinction and adapt to new environments.
Crese que como resultado da exaptación, ou facer que ADN previamente “inútil” se utilizase para incrementar as probabilidades de supervivencia, os mamíferos podían xerar novas estruturas cerebrais e comportamentos para sobrevivir mellor á extinción en masa e adaptarse a unha nova vida.