Busy Beavers
Busy Beavers had the second largest YouTube channel subscriptions gain in 2019 with an increase of over 36 million, ending the year on 67.4 million in channel subscriptions. In 2018, YouTube's algorithm recommended Busy Beavers's video "The Apple is Red" 650 times "among the 696,468 suggestions that Pew Research Center tracked" making it the most recommended video on YouTube. As of September 2020, that video has received over 3.2 billion views on YouTube, making it the 19th-most viewed video on the site. In addition, their second most popular video, "Red Car Song", has received over 2.5 billion views, making it the 36th-most viewed video on the site.