Merlin (bird) this phenomenon is due to the fluctuations of supplementary food stocks discussed above. Merlin (bird) The merlin ("Falco columbarius") is a small species of falcon from the Northern Hemisphere, with numerous subspecies throughout North America and Eurasia. A bird of prey once known colloquially as a pigeon hawk in North America, the merlin breeds in the northern Holarctic; some migrate to subtropical and northern tropical regions in winter. Males typically have wingspans of , with females being slightly larger. They are swift fliers and skilled hunters who specialize in preying on small birds in the size range of sparrows to
Yellowish imperial pigeon a bluish base to the bill. Yellowish imperial pigeon The yellowish imperial pigeon ("Ducula subflavescens"), also known as the yellow-tinted imperial pigeon or Bismarck imperial pigeon (leading to easy confusion with "D. melanochroa"), is a relatively large species of bird in the family Columbidae. It is endemic to forest and woodland in the Bismarck Archipelago. It is threatened by habitat loss. It is often considered a subspecies of the Torresian imperial pigeon (which in turn sometimes is considered a subspecies of the pied imperial pigeon), but is increasingly treated as a separate species. It resembles the Torresian imperial pigeon, but