Which of the following is NOT a primary factor that affects wildfire spread?

Wildfire spread is influenced primarily by three main factors: weather, fuel, and topography. Weather includes elements such as temperature, humidity, and wind, which can significantly impact how quickly and aggressively a fire spreads. Fuel refers to the materials that can ignite and sustain combustion, such as grass, shrubs, and trees. The topography of the area, including features like slope and lateral confinement, also plays a critical role as it can affect wind patterns and the ability of a fire to move across different surfaces.

Wildlife presence is not considered a primary factor in wildfire spread. While wildlife can play a role in fire ecosystems, such as through their impact on vegetation and soil health, they do not directly influence the mechanics of how fire propagates across landscapes. Instead, the focus remains on understanding how external factors like weather, the type and arrangement of fuels, and the topographical features of the landscape contribute to the behavior of wildfires.