Ridgetop Swiftlet
RIDGETOP SWIFTLET
Collocalia isonota
Mt. Apo, Mindanao
endemic
Bird # 509 - October 2017 Ridgetop Swiftlet is a newly split Philippine endemic. The race isonota bagobo is found at upper elevations in Mindoro, Mindanao, and Sulu archipelago. It is described as "uniformly mid-glossed green on dull dark blue with absent to faint contrasting pale rump". The other race is isonota isonata found in north Luzon mountains.
The paper by Rheindt et al describing the split says that "there is evidence of more geographically widespread and intra-island variation in rump color than has so far been reported". The swiftlets we observed had a faint pale rump.
Read MoreCollocalia isonota
Mt. Apo, Mindanao
endemic
Bird # 509 - October 2017 Ridgetop Swiftlet is a newly split Philippine endemic. The race isonota bagobo is found at upper elevations in Mindoro, Mindanao, and Sulu archipelago. It is described as "uniformly mid-glossed green on dull dark blue with absent to faint contrasting pale rump". The other race is isonota isonata found in north Luzon mountains.
The paper by Rheindt et al describing the split says that "there is evidence of more geographically widespread and intra-island variation in rump color than has so far been reported". The swiftlets we observed had a faint pale rump.
