How did mammals survive this mass extinction?

Mammals survived the mass extinction event around 66 million years ago, likely due to their small size, which allowed them to exploit diverse habitats and food sources. Many mammals were nocturnal and burrowing, providing shelter from the extreme environmental changes following the impact event. Their varied diet and reproductive strategies, including live births and parental care, may have also contributed to their resilience during this period of upheaval. As a result, mammals were well-positioned to diversify and thrive in the aftermath of the extinction.