What Arctic Tundra animals eat diamond leaf willow?

In the Arctic tundra, animals such as caribou (reindeer) and various species of hares, like the Arctic hare, are known to eat diamond leaf willow. These herbivores rely on the willow's leaves and branches for sustenance, especially during the harsh winter months when other food sources are scarce. Additionally, some birds, such as ptarmigans, may also consume the foliage. The diamond leaf willow plays a crucial role in the diet of these animals, contributing to their survival in the tundra ecosystem.