Final answer:
A man was tracking a grizzly bear with cubs that was different because it was a grolar bear, a hybrid between a grizzly bear and a polar bear, made possible by habitat overlap due to climate change.
Step-by-step explanation:
In the text provided, a man was tracking a grizzly bear with cubs. What made this bear different was that it was a hybrid known as a grolar bear, a cross between a grizzly bear (Ursus arctos horribilis) and a polar bear (Ursus maritimus). This hybrid animal is particularly notable as the two species of bears, historically considered separate ecological species due to living in different habitats, have had overlapping habitats which is a possible consequence of climate change. The fact that these two species are now mating and producing viable offspring such as the grolar bear, underscores the profound impacts that climate change can have on wildlife and their ecosystems.