Science tells us invasive species—like the spotted tilapia—are always on the move, making it difficult for scientists to ...

The IUCN did acknowledge, however, that the mourning dove's population is decreasing. "The species' population in ... the impact of hunters and invasive human activities will be even more pronounced.

However, when a non-native species is introduced to an ecosystem, it has the potential to become invasive: there are no natural predators or other guardrails keeping it from outcompeting the ...