Millions of pet penguins died in China on Saturday — and the oldest ones were just over 13 years old.

The penguins were the hallmark of Tencent’s QQ Pets — a popular online game launched in 2005 — that the tech giant shut over the weekend following a sharp decline in active players. Over the years, millions of users have fed and raised the penguins on their digital screens, even helping the birds to get married and reproduce. But now, even a “resurrection medicine” — an in-game potion that allowed users to revive their ailing animals — can’t save the penguins from extinction. Tencent said that it will clear all user data by the end of September, wiping out some of Chinese millennials’ most cherished memories.

Rest in peace, QQ Pets. (Image: IC)