Envy is often associated with the color green, as in "green with envy", and yellow. Yellow is the color of ambivalence and contradiction; a color associated with optimism and amusement; but also with betrayal, duplicity, and jealousy. The phrase "green-eyed monster" refers to an individual whose current actions appear motivated by jealousy not envy. This is based on a line from Shakespeare's "Othello". Shakespeare mentions it also in "The Merchant of Venice" when Portia states: "How all the other passions fleet to air, as doubtful thoughts and rash embraced despair and shuddering fear and green-eyed jealousy!" The character Envy from Fullmetal
Green-eyed tree frog rejected by female green-eyed tree frogs from the south. Their geographic separation has caused a change in mating calls, that continues to drive the two types of green-eyed tree frogs apart. If and when the females from the southern region decide to mate with the males from the north, they are re-productively disadvantaged. Their crossbreed offspring don't survive as long as the frogs whose parents breed with other frogs from the same region. Scientists now use the green-eyed tree frog in their studies of speciation and evolution due to the mating habits of the frogs in Australia. When it comes