Actor and animal activist Joaquin Phoenix is speaking out against the horrific cruelty to monkeys and other animals documented in a recent undercover investigation by Last Chance for Animals (LCA).

The investigation, conducted over a span of 4 months at International Toxicology Research (ITR) labs in Montreal, documents macaque monkeys, as well as dogs and mini pigs, suffering immensely in intense confinement and excruciating experiments. At this lab, workers force tubes down the animals’ throats, then pump their stomachs full of toxic substances. At the end of the experiment, the dogs and mini pigs are killed. Typically, the monkeys are kept alive to suffer through experiment after experiment. Their suffering may last for decades, as macaques can live for up to 30 years.

In the video above, Phoenix focuses on the macaques, noting that they will never see natural light, and experience great fear and pain throughout the brutal experiments.

The truth is that better, cruelty free alternatives exist — there’s just no excuse to torture animals for science any longer. Thank you, Mr. Phoenix, for helping get the message out.