Thick fur common to her breed and the mild winter in eastern Poland so far this year have also helped her.
But Mr Kowalczyk, who is also the director of the Mammal Research Institute at the Polish Academy of Sciences warned that a cow living among bison could be dangerous to both species.
The cow 'chose freedom' roaming with a group of bison in Poland. Picture:
If the cow gets pregnant after mating with a male bison, she could die because the hybrid calf would be bigger than a normal cow calf.
And the offspring could likely disrupt the genetics of the small and endangered bison population in Poland - a lot of work went into restoring them after they faced extinction following the First World War.
Mr Kowalczyk, went on to say that the cow is still too young to breed but that it looks like her winter adventure may come to an end soon. She must be recaptured before spring, to prevent the risk of mating.
One question is whether when winter ends the cow will follow the bison into the forest, which is not the habitat that this cow knows.
The more time she spends in the herd, the riskier it will be.