The "Kangaroo Question"

"Answer, in your own words, the "kangaroo question."  Why do some species only live in one part of the world, even though there are other environments which could be suitable?"

     The answers to this question are actually quite simple.  They might stay in the place that they live because a behavioral pattern keeps them there.  For instance, some animals might prefer to eat a certain kind of food that can only be found in a certain area.

     Another reason is that they might not be able to thrive in any other environment.  Yes, they might be able to live there, but they might not be able to thrive there.  Thriving entails their offspring being able to survive in the environment, the animals being able to avoid particular parasites or predators, etc.

     Another reason is that they might only be able to travel a very short distance in their lifetime.  For example, some bugs might be able to do just fine in multiple places of the world, but these bugs can't get there.  Unless the bug has some help from us humans of Earth, it won't live long enough to see the "land across the sea".

      Thanks for reading, and please let me know what you think!