Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Two birds making a nest each made 10 round trips collecting building materials. If the building materials were located 200 miles from where they were building the nest, what is the total distance the birds covered in the trips?

### Response:
In one round trip, traveling to and returning from the building materials location, one bird covers 2*200 = <<2*200=400>>400 miles.
In 10 round trips, a bird covers 10*400 = <<10*400=4000>>4000 miles
The two birds together cover a distance of 4000+4000 = <<4000+4000=8000>>8000 miles collecting the building materials in 10 round trips.
#### 8000