Prey species like moths would probably see a sharp rise in population if there were no predators in the forest. These prey species could consume an excessive amount of food resources if there were no predators to control their population growth, which would result in overcrowding and resource competition. Under this scenario, there would probably be fewer food resources available, which would force moth populations to adapt in order to survive. One possible adaptation would be a shift in the colors of the moths. More adept at hiding from their surroundings, moths stand a better chance of surviving because fewer predators will be able to identify and consume them. The moth population's color may change over time as a result of this selective pressure, since individuals who can more effectively blend in with their environment have a higher chance of surviving and dispersing their genes. This process, known as natural selection, could result in the evolution of different coloration patterns in the moth population. In general, the lack of predators in the forest would probably cause moths to gradually change color as they acclimate to their new surroundings and the stresses of population growth and resource competition.
Overall, without predators, the moth population would likely experience a boom in numbers and potentially have to adapt through changes in coloration to survive in the face of increased competition and limited resources. This would be a natural response to the absence of predators and the need to blend in with their environment to avoid being preyed upon.
