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activity adaptation aestivation animals annual Antarctica Arctic artiﬁcially autumn average basking shark behaviour biological bird migration birds breeding season cause cave climate clock cold colour continents cool-temperate cycle dark daylength deﬁnition desert despite Earth effect environment equator example exist extremely fact ﬁeld ﬁnd ﬁrst ﬁsh ﬁve ﬂoods ﬂow ﬂower ﬂuctuations ﬂy gland growth heat hemisphere hibemation hibernation hormone human hypothalamus ice age inches inﬂuences insects land latitude leaf lemming less light living long day plants mammals metabolism migration miles million monsoon month moon night normal northern northern hemisphere oestrogen orbit organisms palolo worm period pituitary pituitary gland plants polar poles rain rainfall regions rhythm scientiﬁc sexual short day plants situation snow snow buntings species spring square miles summer temperate world temperature trees trigger tropical warm warmer warmth winds winter zeitgebers zone