Before revision: While other bat genuses such as myotinae and murinae inevitably lost the twinning trait, the vespertilionidae genus retained a high trait frequency due to mutation and environmental conditions that triggered natural selection.
After revision: While other bat subfamilies such as Myotinae and Murinae inevitably lost the twinning trait, the family Vespertilionidae retained a high trait frequency due to mutation and environmental conditions that triggered natural selection.