Two eggs but only one chick

himbrimi-9
Himbrimi – Great Northern Diver – Gavia immer

The Great Northern Diver raises its chicks on trout fry and therefore resides on lakes that offer such food. This Diver has  one chick which is most common although the eggs are two. The parents can seldom find enough food for two chicks to survive, thus only one lives to become an adult. This bird with its chick was in Veiðivötn Lakes in the southern highlands.

Feeding its chick
Feeding its chick