Perhaps not surprisingly, in view of their ready availability, birds which eat insects (in addition to the aerial insectivores) have evolved in both Old World and New world regions:-

• Old World Flycatchers - 1.2% of world’s species.
• New World Flycatchers - 4.3% of world’s species.

In the following examples the percentages are of the OW and NW species respectively:-

Open woodland with bush and scattered trees.
OW. (7.5%) - African grey, Pale, Ashy, Spotted, Gambaga, African Dusky, Lead-coloured, Grey Throated Flycatchers.
NW. (27.2%) - Ash-throated Flycatcher, Couch’s, Cassin’s, Western, Eastern Kingbirds and Scissor-tailed Flycatcher.

Woodland and forest trees.
OW. (47.8%) - Eurasian Pied, Collared, Semi-collared, Yellow rumped, Slaty backed, Rufous chested Flycatchers.
NW. (27.4%) - Western Wood- pewee, Eastern Wood Pewee, Yellow-billed, Least, Hammond’s, Willow Flycatcher.

Highland, forest edge, coniferous.
OW. (6.0%) - Southern, Northern, Black, Yellow-eyed Flycatchers.
NW. (13.6%) - Olive-sided, Grey and Dusky flycatchers.

Low to mid-level foliage.
OW. (38.7 %) - Asian brown, Ashy breasted, Olivaceous and Cassin’s Flycatcher.
Riverine and swampy woodland, ravines and gorges.
NW. (31.8%) - Acadian, Alder, Cordilleran, Flycatchers, Black, Eastern and Say’s Phoebe, Great Kingbird.