Adelie Penguins Gift Shiny Pebbles
Male Adelie penguins try and woo their female counterparts in a courtship ritual involving shiny pebbles. They’ll scour the beaches to find the smoothest, shiniest pebble they can find to bring as a gift for the females. They’ll also put on a display of beak thrusting and neck arching. If she likes the gift, she’ll line her nest with it and mate with the male. The two will work together to continue building the nest that will eventually hold their eggs. The female typically has two eggs. If another male shows up with the right stone, the female will also mate with him. These penguins keep the love alive with their adorable pebble gifts (Britannica).