Romance isn't dead (at least for penguins).

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An African Penguin holds a Valentine's Day card at the California Academy of Sciences
Credit: Justin Sullivan/Getty Images

Penguins just may be the hopeless romantics of the animal kingdom.

While it's not entirely true that penguins mate for life, many species of penguin are considered serial monogamists, and some do maintain the same partner throughout their entire life.

African Penguins walk by a Valentine's Day card at the California Academy of Sciences in San Francisco
Credit: Justin Sullivan/Getty Images

And the penguins at the California Academy of Sciences in San Francisco are making some seriously romantic gestures to celebrate St. Valentine. In an annual tradition, scientists hand out red, felt hearts to the African penguins on Feb. 14, Associated Press reported.

California Academy of Sciences senior biologist Jarrod Willis gives an African Penguin a Valentine's Day card at the California Academy of Sciences
Credit: Justin Sullivan/Getty Images
An African Penguin pulls a Valentine's Day card into its nest box at the California Academy of Sciences in San Francisco,
Credit: Justin Sullivan/Getty Images

The penguins then use the felt to reinforce their nests and build their bond with their partner. The male penguins are often the ones to retrieve the heart, bringing it back to the female partner. Photographs from the day's festivities show proud penguins waddling around with symbols of their undying love.

Fans of the penguins who want to watch the holiday unfold in real time can check out the research center's three live penguin cameras.