The energy used to be relatively high because these birds have short wings, making it faster than the rate of tongkraphue common birds so poised in the air.
The energy used to have quite a large amount. Because the birds have short wings. It must blow at a faster rate than the common birds to remain in the air.
The energy used to have a relatively high amount. Because the birds wings, short. Make it to flutter at a faster rate than common to keep balance in the air.