When a white pine has been infected with white pine blister rust (a fungus), cankers appear on the branches and sometimes the trunk of the tree. A large amount of sap-like ooze flows from the cankered areas, sometime drying and resembling a sugary-looking crust or film. These areas are, in fact, high in sugar content, and rodents frequently chew them. It’s likely that a red squirrel visited and sampled the infected white pine in the photograph, leaving a freshly-gnawed patch in the bark.
This is the common bounding pattern of a red squirrel in snow. When it bounds, or hops, its smaller front feet land first, and then the larger hind feet pass to the outside and around the front feet to land in front of them. In this photograph the squirrel is headed towards the top of the photograph . There are many exceptions to the rule, but often bounding animals that are tree climbers, such as squirrels, often place their front feet more or less side by side, whereas animals such as rabbits and hares, which do not climb trees, often place their front feet diagonally, one in front of the other.