Hi stamp,
I also don't see that your question forces out the creation model. We don't know how the various plants and animals migrated or moved about or found their specific places on the earth after the creation event. There are many animals that have rather specifically outlined habitats. Lions and penguins are found in fairly limited areas of the earth. There are many anomalies concerning animals that we don't really know the 'why' or 'how' of their existence. For example: Bird migrations. There have been several studies done on 'why' birds seem to have such an uncanny ability to know when and where to migrate. One that fascinated me was a study where migratory birds were put in isolated boxes with no ability to see the sky or sun and yet at the proper time they would all orient south. Even if the enclosures were turned, within a very, very short time the birds would again orient themselves back to the southerly direction. It's as if they actually have some sort of built in compass.
Evolutionists will tell you that this is some sort of evolved knowledge or ability. Creationists merely believe that just as God gave unto Adam and Eve the ability to communicate with each other and that same ability lies in the mind of every human, so to, did He create all the other creatures with their specific abilities to do the things that they do; to live in the places where they live upon the earth. Some creatures seem to be able to adapt and live pretty much all over the earth. Some creatures have very limited habitats. The Scriptures tell the believer that God made everything and that it was perfect in its created form when all things were created by God.
One of the understandings that I have of the things of God is that we don't have to be able to explain or understand the 'how and why' of the creation event. We don't have to understand the 'how and why' things have continued as they have and become what they have become. God merely asks us to believe and trust in Him. So, for me, whatever the reason that a particular animal seems tied to a particular habitat or why the birds do what they do doesn't have to be understood. It merely is what it is and it is what it is because God made it to be that way.
I believe God. He gave unto me a fairly detailed account of the 'when' and 'how' of the creation event. Several times His word tells us that He created all things and a couple of times we are told the time in which He made all things. His word tells us that He created Adam out of the dust of the earth and then created Eve from Adam. His word then tells us, through the genealogies, when this first man and woman were created, approximately. Evolutionists and many scientific methods tell us that this simply can't be true. However, despite all the arguments against the simple truth of God's word being true, I believe God.
Many will say that's foolish of me and hard-headed and closed to the truth. You know what? Many said the very same thing about Noah. Elijah stood apart from the general population of Israel. While they were worshiping other gods and building altars to these other gods that they truly believed in their hearts existed, Elijah stood apart. He stood against all that they believed and while they danced and screamed and cut themselves to wake up their non-existent gods to throw down fire upon the earth, Elijah stood back and apart from them. When it came his turn, he tried to make it nearly impossible for his God to do what they were wanting to see done, but God did it!
Sadly, as concerns the creation and the things of God, men aren't nearly as wise and smart as they would make themselves out to be, in my understanding. I believe God. God said He created this realm in 6 days and, according to the genealogies that 6 day period would have been about 6,000 years ago and I believe that. I believe it not because I can prove it, but because God has said it.
BTW, some of this understanding of the creation event comes from understanding also the end of this realm. God created this realm in order that He could come to the day in which He will also destroy and remake this created realm. That day when He will declare, "Now the dwelling of God is with men and they will be His people and He will be their God." All of this 'age' in which we live was created for that day that is coming. When all mankind will know the truth of God.
God bless you,
In Christ, ted