Lots of bark from PETA, but no bite from Fox.

People for the Ethical Treatment of Animals (PETA) made another attempt to make noise on Super Bowl Sunday by way of an ad; this time, the group's rejected commercial featured strong allusions to Colin Kaepernick and other NFL players' protests against police brutality and injustice.

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"Positively acknowledged by Kaepernick himself, this project pays homage to all movements that remind us to open our hearts and minds and reject all forms of injustice, including sexism, ableism, racism, ageism, homophobia, and speciesism," PETA's website reads.

According to TMZ, the commercial, which features anthropomorphic kneeling animals as a nod to Kaepernick and other players' protests, properly conveyed what PETA was going for, and the NFL subsequently put pressure on Fox to reject the ad.

After submitting the ad for review in December, Fox has been mum on the commercial since. Per TMZ, PETA also has requested that the ad air in local markets, but have gotten no response from the network. It is ultimately up to the network as to which commercials air during the game, so the NFL could have some say in the situation, but not the final one.

This isn't the first time that PETA has failed to make the airwaves during Super Bowl Sunday. In past years, much racier and steamier commercials haven't been aired, usually focused on sex and veganism.