Red imported fire ants are strong competitors with many ant species. They have managed to displace many native ants which has led to a number of ecological consequences. However, studies show that these ants are not always superior competitors that suppress native ants. Habitat disturbance prior to their arrival, and recruitment limitations, are more plausible reasons why native ants are suppressed. Between "Tapinoma melanocephalum" and "Pheidole fervida", the red imported fire ant is stronger than both species but shows different levels of aggression. For example, they are less hostile towards "T. melanocephalum" in contrast to "P. fervida". Mortality rates in "T. melanocephalum" and "P. fervida" when fighting with red imported fire ants are high, being 31.8% and 49.9% respectively. The mortality rate for red imported fire ant workers, however, is only 0.2% to 12%. The imported crazy ant ("Nylanderia fulva") exhibits greater dominance than the red imported fire ant and has been known to displace them in habitats where they encounter each other in. Larger colonies of pavement ants ("Tetramorium caespitum)" can destroy red imported fire ant colonies, leading entomologists to conclude that this conflict between the two species may help impede the spread of the red imported fire ant. Individuals infected by SINV-1 can be killed faster than healthy individuals by "Monomorium chinense". This means that ants infected with SINV-1 are weaker than their healthy counterparts and more than likely will be eliminated by "M. chinense". However, major workers, whether they are infected or not, are rarely killed.