how does it behave?
It perches for long time, emerges to prey on birds with  fast, parrot-like wingbeats. Occasionally, it soars high.
Taita falcon
This species spends much of its time perched inconspicuously, emerging to pursue small birds with fast, parrot-like wingbeats. Occasionally, it soars high.
what is referred to as pale crag martin? A small passerine bird. from where did its name originate? The genus name is derived from the Ancient Greek "ptuon", "a fan", referring to the shape of the opened tail, and Procne , a mythological girl who was turned into a swallow. The specific name "obsoleta" means "worn" in Latin. where is it found? Northern Africa to Middle East extending up to Pakistan and Afghanistan. what are its sub-species? UNANSWERABLE any species which hunts them? Peregrine falcon, Taita falcon, African hobby and wintering Eurasian hobby. what exactly is the first one? A widespread bird of prey. and the second one? It is another type of small falcon.
wiki:15876785
Taita falcon [SEP] Behaviour
This species spends much of its time perched inconspicuously, emerging to pursue small birds with fast, parrot-like wingbeats. Occasionally, it soars high. Prey is captured on the wing and carried back to the perch to be eaten. It breeds April to September in East Africa and July to December in southern Africa. The nest is normally on bare rock, the clutch size is two to four eggs, incubation lasts 31–33 days, and the chicks fledge after about 42 days.