ML634733025

Ажиглалтын дэлгэрэнгүй

Photos are dim, so the bill coloration difference could not be seen, however, when the bird on the left is enlarged and lightened a bit, the thin white stripes on tail feathers of the black-billed cuckoo can be seen, differentiating from the large white oval patches on the underside of the tail of the yellow-billed cuckoo.