Referencing the ancient text Horrors of War: Deadliest Biological Weapons of All Time by Hun Tzu, A.K.A. "Hot Soup", I can create a Kitten Factory on the lower left corner. Being that that is blocked, chapter 3, "Deployment", page 84, clearly states that I must move the factory to the right or upwards, whichever one being my choice, until it is placeable. As you all must know, kitten factories produce kittens inside the space in the factory whenever it is clear, and the space next to the door must not be blocked (chapter 1, "Rules"). Chapter 1 further states that when the door is opened, a kitten will move out two spaces, and there will be an opportunity to close the door the following turn. A kitten must not block the doorway; if it would block the doorway by moving out, it will be too frightened to do so. In addition, any player may open or close the door, but only once per turn. Chapter 4, "Engagement", page 103, briefly goes over the fact that kittens grow into cats after two turns of existence.
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On the subject of cats: The same text, Horrors of War: Deadliest Biological Weapons of All Time, chapter 5, "Biological Weapon Physiology", states that cats are composed of 1 flesh and 1 bone, and that each turn, a fully-grown cat will produce 1 more cat in a random available orthogonal direction. Another book, The Beginning Architect, chapter 3, "Workshops", details plans for a butcher's workshop. It states that any dwarven unit can build a workshop in one turn, and that the workshop, when operated by an adjacent dwarf, will turn up to 5 cats (among other things, for example 1 cow) into their constituent parts. The text Dwarf Fortress For Nobles (an excellent and useful read; I recommend it) states that 1 dwarf can hold an infinite stack of meat/bones/etc., and requires 10 meat to increase its level. It also explains the details and operations of crossbows and bones, which I shan't repeat here, or at least not until it becomes relevant.