I'm always amazed at how my creative process works. (That sounds a bit weird and pretentious, but stay with me.) Over the time I've been making Noah's Arks and the animals, the designs have evolved and changed. Most changes have come when I have a slap your head and wonder why I didn't do this before moment. I make the smaller animals out of a solid piece of wood but larger ones are made of at least two wood layers so that I get a realistic look. The layered animals take a lot more wood and work so they are priced a bit more. The relative size of the animal has made the difference in which category or size they fall, but the Koalas have been a three layer animal even though they are smaller.