For me, the biggest form of suffering, in terms of length of suffering and in terms of numbers of individuals suffering is always the loss of habitat for wildlife animals BUT not the generally violent death of predation. This is a big drive for me in all my efforts to improve lives of animals. This website does not address that at all and only has two hits in a search for the word "wildlife"... one being the link below. Note the high emphasis on predation and lack of other solutions. Working on lots of animal farms for a wide variety of species, I am convinced that the suffering levels are usually low due to it not making financial sense to have unhealthy animals. Predation is also prevented so a domestic animal can have a very peaceful and healthy life compared to their wild counterparts. Going vegan is also a dead-end goal... once you have become vegan, there is no more you can do on that front.
http://www.effectiveanimalactivism.org/wild