The Calgary Zoo has kicked off a "lovey, hearty" Valentine's weekend with special heart-shaped treats for the penguins, zoo officials said.

Calgary Zoo curator Colleen Baird

Curator Colleen Baird is aiming for a "lovey" weekend at the zoo. (Evelyne Asselin/CBC)

The penguins were given herring — frozen into special shapes — to play with before eating the fish as the ice blocks melt.

It's all part of the zoo's Valentine's weekend celebrations, which go on until Sunday.

"We do some fun [activities] themed in a lovey, hearty way," says general curator Colleen Baird.

Tomorrow, in honour of World Hippo Day, the hippos will be getting special watermelon treats.

Calgary Zoo Hippo

Lobi the river hippo is in for a watermelon treat on Saturday, which happens to be World Hippo Day. (Calgary Zoo)

And on Sunday — the big V day — zookeepers will be handing out roses to the gorillas.

Not sure what gorillas do with roses? You'll have to wait until Sunday to find out, Baird says.

Calgary Zoo celebrates Valentine's weekend1:04