All r-selected species are specialists.

R-selected species are typically characterized by high reproductive rates, early maturity, small body size, and short lifespan. They are often generalists, able to adapt to a wide range of environmental conditions and food sources. In contrast, K-selected species, which have lower reproductive rates and longer lifespans, tend to be more specialized and have specific adaptations for their niche. Therefore, all r-selected species are not necessarily specialists.