A Liger (Lion x Tiger)

A Zorse (Zebra x Horse)

A Zonkey (Zebra x Donkey)

What is a "kind"?
Our CREATOR originally created many different types of creatures, each "kind" having a DNA genome capable of a vast potential for variation within that kind. Yet, the potential for variation was not infinite, but limited and fixed. Remember from our previous studies on creation, that no new information is ever added through either mutation or recombination of DNA. An original canine kind, for example, produced all of the varied dog-like animals (wolves, coyotes, foxes, pet dogs). [* Click here to see the Dog Kind Chart, or the Dog Variation Chart, by Ken Ham from his book, One Blood.) But no matter how many times you reshuffle the genes of a canine, you cannot produce a line of qualitatively new creatures that become a new kind such as primates.

Classification: The creatures we see today are classified by men merely according to general physical similarities in the following taxonomic hierarchy using Latin terms:
Kingdom, Phylum, Class, Order, Family, Genus, Species.
Example of Humans = Animalia, Chordata, Mammalia, Primata, Hominidae, Homo, Sapiens

A biblical "kind" taken on Noah's Ark would have represented a "genus" or possibly even a "family". Since the flood, each "kind" has undergone variation through both natural and artificial selection into various related species, but (not macro-evolution) into new kinds. Today a species is often defined as a group of animals who cannot interbreed with another group. However, many modern species can interbreed (dogs/wolves; lions/tigers (liger), whales/dolphins (wholphin), zebras/horses (zorse) - click for pics). In addition, the current inability of some modern species to interbreed within their genus or family is primarily due to structural variation (house cat & a tiger), and destructive DNA mutation. Remember that all mutations known involve a loss of genetic information, not an addition of information.

Therefore, back in Noah's time before the flood, the number of "kinds" was dramatically smaller than the number of species and even genera we see today.

The full article/sermon is online at:
"A Zookeeper Looks At Noah's Ark: How'd All the Animals Fit?" http://www.soulcare.org/Genesis6v14-7v24-Ark-Animals.html

The above pictures were taken from the excellent magazine, "Creation Ex Nihilo"