Hi veg_77
I agree with Sören about not donating to WWF. If you want to help factory-farmed animals, I'd actually first recommend
Effective Animal Activism itself, which
is fundraising currently. Or if you prefer, donate to one of its recommended charities.
I think there may be slightly more impact from donating to a new charity called Animal Ethics, which is the first charity I know of to tackle the issue of wild-animal suffering from a perspective that fully appreciates the extent of suffering in nature rather than merely trying to preserve natural suffering as much as possible. For more info on how to donate, I can send you an email if you're interested.
Finally, if you're into speculative causes, the
Machine Intelligence Research Institute may be worth considering. I'm actually rather uncertain about the sign of its impact, but I currently incline slightly toward it being positive, and I think its work is extremely important.
If you'd like to discuss wild-animal suffering or anything else further, let me know! Feel free to connect
on Facebook.