Which bird flies the farthest?
The Arctic tern flies a round trip of 21,750 miles a year, breeding in the Arctic in the northern summer and feeding in the Antarctic during the southern summer. The bar-tailed godwit migrates farther in a single trip than any other bird. Each year it travels non-stop from Alaska to New Zealand in nine days and loses over half its body weight.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Which bird flies the farthest?
### Input: 
### Response: The Arctic tern flies a round trip of 21,750 miles a year, breeding in the Arctic in the northern summer and feeding in the Antarctic during the southern summer. The bar-tailed godwit migrates farther in a single trip than any other bird. Each year it travels non-stop from Alaska to New Zealand in nine days and loses over half its body weight.