Yes, certainly. Used cooking oil right now is probably the most popular feedstock because it is the least expensive. Canola oil is another one that's used a lot, but because of the price of canola right now, it's not as attractive as a feedstock.
Every company is going to have a process that's unique to them, but ultimately it's about finding the way to crush the oilseed into a consumable methodology that would allow for the chemical conversion from whatever that oil source or the lipid source of fats is, and that then can be converted into a renewable diesel.
We have technology that can use rendered animal parts as well, which has the greatest GHG potential, because instead of that going into another product and then further decomposing, which would release other GHGs to the atmosphere, we're putting those carbon molecules into a fuel form that can be stored in a much more energy-efficient way.
There are literally dozens of different types of feedstocks, but in Canada your most important ones are used cooking oil, soybean oil, canola oil, and then the rendered animal product.