On Monday, users of the social media site noticed a difference.

The doge meme has taken the role of the blue bird emblem on Twitter.

On the web, the menu's upper-left corner now features a doge icon.

The Twitter logo is replaced with the doge meme at the top of screens on mobile devices.

On the web's loading page screen, Twitter is showing the doge meme.

Although the reason for this change on Twitter is unknown, Elon Musk probably gave his approval or started the change.

When the change occurs after April Fools' Day, the timing is peculiar.

Twitter may have originally intended to modify on April Fool's Day.

The shift was not well-received by many Twitter users.

Because Musk is interested in the doge meme, it has grown in popularity.