Three different behaviors that you made:
1. excavator* - excavator* in the watering of flowers is the excavator* in the back and forth movement at the same time to carry out the bucket up and down movement composition.
2. fish* - all fish* trajectory, speed and direction are randomly generated, so that the movement of fish* looks more natural.
3. bird* - all the bird*'s trajectory, speed and direction are randomly generated, so that the bird*'s movement looks more natural.

One behavior that is not simple:
Not simple: Boys/Girls - The boys and girls are walking around the carousel, and the trajectory of each of them is randomly generated, so it looks more natural.

Animated Articulated Figure:
Articulated: excavator* - excavator* in the watering of flowers is the excavator* in the back and forth movement at the same time to carry out the bucket up and down movement composition.

Other Behaviors that you made: (backup in case something above doesn't count)
1. Meteorites - The trajectory, speed and direction of each meteorite spinning around the world are randomly generated, making the movement of the meteorite look more natural.
2. Clouds* - Clouds* will move slowly and it will block the sun*'s rays, making the scene look more realistic.