Just think of animals or plants or whatever, that could exist on this world or already do, then add a slight bit of fantasy
Examples:
[list]
[*]Fruit that makes you fall asleep when you eat it, after which the cute birdlike things that were singing in its branches come down and slowly bite you to death so the tree can use your body as compost (except that a nearby berry bush has berries that keep you awake, so if you ate those you are fine) [/*]
[*]Sabertoothed black panthers that can camouflage so well in the dark that nobody can see them.[/*]
[*]Crocodiles who can climb trees[/*]
[*]Birds who hypnotize you with their songs[/*]
[*]Incredibly soft trees with sappy fruit (they are soft like that because the creatures that sleep against them will defend the tree from some mean herbivore) (I dont know be creative)[/*]
[/list]