* Environment: A species thriving in the Arctic would be ill-suited to the Amazon rainforest.
* Adaptations: Physical and behavioral traits that help a species survive in its environment.
* Competition: How well a species competes with other animals for resources.
* Predators: Whether the species has defenses against predators.
* Disease: How vulnerable the species is to disease.
* Human Impact: Human activities like habitat destruction and climate change can drastically affect survival.
However, some animals are generally considered to be more adaptable and resilient:
* Insects: Insects are incredibly diverse and have adapted to almost every environment on Earth. Their rapid reproduction rates and ability to exploit a wide range of resources make them successful.
* Rodents: Rodents are also incredibly adaptable, with high reproductive rates and the ability to survive in a variety of habitats.
* Microorganisms: Microscopic organisms like bacteria and viruses are masters of survival, constantly evolving and adapting.
Ultimately, the survival of any animal depends on its ability to adapt to changing conditions. The animal with the most flexible and adaptable traits will have the best chance of survival.