Snowy owl

The snowy owl ("Bubo scandiacus") is an owl native to the Arctic regions of North America and Eurasia. They hunt rodents. 
Lemmings are a favourite prey. They will also hunt fish and small mammals
The male's mating call sounds like "krek-krek", while the female's mating call sounds like "pyee-pyee" or "prek-prek".
In the novel "Harry Potter and the Philosopher's Stone" (USA edition: "Harry Potter and the Sorcerer's Stone"), Harry is assigned a female snowy owl as his animal companion. Her name is Hedwig.