At two points in the Creature Stage, after reaching a certain level and respawning, a cutscene will play with your nest migrating. One of the creatures waves goodbye to the one looking after your egg, all the while with somber music playing.
There's one adventure, Delicate Negotiations, that reenacts Romeo and Juliet. Instead of staying true to the original story, the adventure shows what would happen if the play had a happy ending. However, Your Mileage May Vary.
If you chose the Neutral path in the Creature Stage, your chief in the Tribal Stage will be able to summon the Sea Monster/Border Patrol to scare fish out of the water. After giving them a good scare, the monster waves goodbye to the chief and returns to the sea.
If you go on the social path, seeing your little butterfly-thing (or whatever you have) befriend a giant hideous monster.