修正:如果环境复杂性更大, tarantula 福利可能会得到改善:对巴西黑 tarantulas (Grammastola pulchra) 的初步行为研究

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...