**Up Direction** | U | The up direction for the calculation of the initial orientation. | Vector |

**Acceleration** | A | The vector of the Quelea's acceleration. | Vector |

**Lifespan** | L | Number of timesteps that the Quelea will be alive for. If negative, lifespan will be infinite. | Integer |

**Mass** | M | Affects how strongly the Quelea reacts to forces. Larger masses will lead to more cumbersome movement. | Number |

**Body Size** | B | The diameter of the extent of the Quelea's bounds. This is used for collision detection among other things. | Number |

**History Length** | N | The number of past positions to remember for each Quelea. | Integer |