The Raso Lark is a small lark known from Raso Islet in Cabo Verde. In 2018, BirdLife reported a translocation to Santa Luzia, part of its historical range.
The upper feathers have dark brown centers and pale edges that create a scaly look. The underside is whitish, with dark streaks on the breast.
The Raso Lark lives only on Raso Islet in the Cape Verde Islands, an island of about seven square kilometres. Researchers followed marked birds from 2004 to 2017, searching for them again to estimate adult survival. The population changed greatly from year to year, and both rainfall and population size were linked with variation in survival.
Average annual survival was about 81% for males and 83% for females. Estimates varied from 57% to 95% among years and were generally higher in wetter years. Male survival was lower when the population was large during dry years. The oldest marked bird was recorded 13 years after it was first ringed. The authors conclude that long adult survival has helped the lark persist on its small island.
An extinction-risk assessment has not been added yet.
Raso Islet is the only island where this lark lives, and it covers about seven square kilometres. The study found that adult survival changed among years and tended to be higher in wetter years. Long-term records of rainfall and adult survival can help explain changes in this island population.