According to the critical values table, where we use a=0.05 and df=6 (2 fewer than the number of bears), a value of r exceeding 0.707 implies that r=0.855 gives us a 95% probability that there is a significant linear relationship between weight and chest size.
The proportion of variation in weight attributable to the linear relationship is given by r^2=0.855^2=0.731 or about 73%.
There is very probably a linear relationship between bears' weight and chest size.