* Adaptation: Animals that are able to adapt to their environment are more likely to survive and reproduce. This can include adaptations to climate, food, predators, and other challenges.
* Reproduction: Animals that are able to reproduce quickly and successfully are more likely to increase their population and spread to new areas.
* Competition: Animals that are able to compete for resources, such as food and territory, are more likely to survive and reproduce.
* Predation: Animals that are able to avoid predators are more likely to survive and reproduce.
* Disease: Animals that are able to resist disease are more likely to survive and reproduce.
In addition to these factors, there are also a number of other factors that can contribute to the success of animals, such as their intelligence, social behavior, and ability to learn.
Ultimately, the success of animals is determined by their ability to survive and reproduce in their environment. The animals that are best able to do this are the ones that are most likely to thrive and spread to new areas.