Well, I don't know if there's much to explain. The Bible says on the Third Day, He created grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth.
On Day Four, He creates the Sun, the Moon, and the stars.
On the Fifth Day, He created the great sea creatures, and every living creature that moves, which the waters brought forth abundantly, according to their kind, and every winged bird according to its kind.
On Day Six, He made living creatures according to their kind, cattle, and creeping things, and beasts of the earth according to their kind. Finally, He made man from the dust of the ground, and created woman from a rib in his side.
Whether these "kinds" correspond with the current taxonomic definition, I don't know. Clearly, there is a distinction between the different animal kingdoms, and we are to understand that they were all created in their current recognizable form at once, (not stretched out over millions of years.)
After that, I'm not sure. The Bible doesn't give a lot of details about how these creatures migrated or propagated, other than to understand that it was via the same way they do now.
There is a short account of Abel being a keeper of the flocks, so animal husbandry was practiced from the very beginning. Same with Cain's tilling of the land and raising crops. It started at the very beginning of man's living in a fallen state.
There are references to sacrifices, but no big mentions until the Flood account beginning in Chapter Six. We see God bringing all the animals to the ark. "Of clean beasts, and of beasts that are not clean, and of birds, and of everything that creeps upon the ground," - By pairs for those animals considered "unclean" and by sevens for all the birds and those animals considered "clean."
After the flood, both a raven and a dove are mentioned as being on the ark. These both leave the ark by air once they have found a place to land and/or eat, (signifying the Earth was again becoming habitable.)
After this, God told Noah to bring forth every living thing that is with you of all flesh, both birds and cattle, and every creeping thing that creeps upon the earth, that they may breed abundantly on the earth, and be fruitful, and multiply upon it.
Interestingly, at this point God puts the fear of man upon every beast of the earth, and upon every bird of the heavens, with all with which the ground teems, and all the fishes of the sea. He says, "They are delivered into your hand."
From there, the animals have done as God intended - they've bred abundantly, have been fruitful, and have multiplied. All the way up until the present.
What else were you wanting to know?
Last edited by Hooday on 10 Jul 2014, 6:11 am, edited 1 time in total.