[6] Horta is a member of the advisory board for the Sentience Institute, UPF-Centre for Animal Ethics, and Organisation for the Prevention of Intense Suffering.

[9] He argued in favor of this position by analogy to sexism or racism, which typically include discrimination against women or racialized people based on criteria such as their alleged capacities and not only gender, sex, ancestry, or physical traits.

[11][12][13] Horta argues that, contrary to what he describes as an idyllic view of the wilderness,[14] animals suffer significantly in nature from disease, predation, exposure, starvation, and other threats.

Horta rejects speciesism, and thus argues that we have good reason to intervene in natural processes to protect animals from this suffering when it is possible to do so without causing more harm.

[19] He also argued that the most promising courses of action right now may consist in gaining more knowledge about the conditions causing wild animal suffering and about how to best carry out measures that can improve the situation of animals affected by natural, or a combination of natural and indirectly anthropogenic, causes.

"[23] Horta has published philosophical work in Spanish, Galician, Portuguese, English, Italian, French, and German.