marisa-miller-peta

Model mom Marisa Miller is baring her baby bump to advocate for animals in captivity as part of PETA‘s new campaign.

“Much like that between human moms and children, the connection between orca mothers and babies is one of the strongest in the world,” the YouTube video is captioned. “Check out pregnant mom Marisa Miller’s important statement in behalf of orcas and their families suffering at SeaWorld.”

The former Victoria’s Secret model, 36, talked about teaming up with PETA for this good cause.

“I’ve always been an animal lover and I do a lot with ocean conservation,” she told PEOPLE. “I always see dolphins when I surf, but I didn’t have the knowledge about how they are acquired. When Blackfish came out, I saw it and I was so upset.”

In the ad, the model mom is seen lying naked in a bathtub in honor of captured killer whales, who are confined to living in small enclosures.

“Even the tanks they do their ridiculous tricks in are way bigger than where they actually sleep,” she shared. “They’re completely confined. That’s why they have all these dental problems because they are chewing on metal and concrete — they can’t even move.”

She went on to talk about the cruelty of capturing wild animals.

“[The animals] are ripped apart from their family, they have to be drugged to handle the environment they’re in,” she said. “There are other ways to experience them. There is a way that you can rehabilitate the animals in an environment that they can swim and you can go check them out.”

She went on to encourage people to boycott SeaWorld.

“It’s about awareness,” she said. “Once the public knows, then they can make their own choices.”

And while she’s long been an advocate for animals, the supermodel admits she was ignorant for years.

“I was so unaware of the realities about how the whales are captured, how they are separated and their emotional capacity. This is an animal whose babies never leave their mother’s side their whole life,” she said. “So as a mother, I have a totally different perspective on relating to that.”

This will be the second child – another boy – for the Sports Illustrated model and her husband, music producer Griffin Guess.

The couple – who were wed in April 2006 – welcomed their son Gavin in December 2012.