First is the Termite. They spawn in little termite nests, converting wood into dead wood blocks and turning those dead wood blocks into more termite nests. You would have to wax your wood with honeycomb to prevent termites from eating it. Another solution is to get rid of the termites altogether. Since they are too small to hit with a sword, you need another mob to do this.
The main function of the Ostrich would be to get rid of termites. Ostriches would spawn in the Savannah, eating termites and eventually turning termite nests back into rooted Dirt. They lay eggs on sand blocks and will not go a far distance away from them. They will not hatch on anything other than a sand block. You can use eggs to make sure Ostriches do not leave a certain area.
Bison would spawn in "Bison Herds." If all the Bison in the herd are killed, no more will spawn, so you will need to actively keep the herds alive. They drop raw bison, the best type of meat, and Bison Hide, which can be crafted into 3 leather.