Nickelodeon posted the video Friday -- just days ahead of June 1, which marks the beginning of Pride -- and it features a cartoon rendering of Nina West, who's a fan fave from 'Drag Race,' leading on vocals -- narrating a parade that's passing her in the background.

The song touches on the makeup of different families that fall under the LGBTQ+ umbrella ... including households with two dads, two moms, non-binary children and more.

Words like "ace," "queer," "trans," "bi, "pan" and other identifying terms used in the community are sprinkled throughout -- and the song doesn't shy away from them ... noting that they can all be part of a family that loves one another. All the families are made up of different animals -- alligators, sharks, turtles, birds, cats, etc. -- that wave/rock rainbow flags.

Now, the overwhelming reaction to this appears to be positive ... with many taking to social media to praise 'Blue's Clues' for being progressive -- and taking proactive steps to teach kids about different family structures in a fun, catchy way that appeals to young children.

On the other hand, there are some who are clutching their pearls over this ... but they're mostly being drowned out by folks saying this is a great thing that Nick/Nick Jr.'s doing.