Which situation suggests wildlife populations are vulnerable?

The situation that suggests wildlife populations are vulnerable is one where there are specific seasons when offspring are born. This is often indicative of a species' reproductive strategy, and if a population concentrates its breeding in a limited timeframe, it can lead to vulnerabilities. For instance, if environmental conditions are unfavorable during that critical breeding season, or if there are high predation levels during that time, the entire population could face significant challenges.

In contrast, high population numbers generally indicate a stable or healthy population, and increasing habitat quality typically enhances population resilience by providing better resources and living conditions. Low migration rates can sometimes be seen as a vulnerability if a species relies on migration for survival, particularly if it leads to inbreeding or limits access to varied habitats or resources that could be beneficial for the population.