Respuesta :
Drought would be one. Another would be if the watering hole was between three species territory in the middle in which they would fight. Another way would be if the more dominant species pushed its way into another persons territorty.
Answer:
Species compete for water when this resource is limited, this limit occurs when there is a shortage of rain, or very high solar radiation. Under these conditions the bodies of water are dried
An example of this competition is when there are 3 species of plants that with their roots suck the water from the ground freatic level, those that have longer and more effective roots can survive.