Postmarked: The Future

Lounging around the house one Saturday afternoon, you are startled out of your reverie by the doorbell. When you open the door, you're greeted by a most unusual surprise - a pair of animal messengers has come to deliver news of your life in the future! But when you open their messages, you see they contain very different predictions of what lies in store for you. One of the animals has brought a letter foretelling a life of happiness and contentment; the other prophesies only disaster and despair.
Which of the animals below brought glad tidings and which an omen of doom? (Pick a different animal for each.)

Animals	Glad tiding	An omen of doom

Source: Kokology - The Game of Self-Discovery