Polar bear the fourhorn sculpin. With the exception of pregnant females, polar bears are active year-round, although they have a vestigial hibernation induction trigger in their blood. Unlike brown and black bears, polar bears are capable of fasting for up to several months during late summer and early fall, when they cannot hunt for seals because the sea is unfrozen. When sea ice is unavailable during summer and early autumn, some populations live off fat reserves for months at a time, as polar bears do not 'hibernate' any time of the year. Being both curious animals and scavengers, polar bears investigate and
Polar concept argument the essence of its polar opposite. Ryle's original argument (1960) runs as follows: A polar concept argument bears on some more or less strong version of dialectical monism, a philosophical doctrine that views reality as a unified whole, due to the complementarity of polar concepts. Polar concept argument A polar concept argument is a type of argument that posits the understanding of one concept, from the mere understanding of its polar opposite. A well-known instance of a polar concept argument is Gilbert Ryle's argument against scepticism (1960). According to Anthony Grayling's characterisation, Ryle's argument can be stated as follows: According