Cassin's Spinetail stands out for its very broad wings and short tail. It flies above humid forests and water in tropical Africa, catching small invertebrates in the air.
Its broad wings and short tail give it a distinctive outline in flight.
It lives around humid forests and freshwater habitats, catching invertebrates as it flies.
At Monts Doudou in southwestern Gabon, a bird carrying a twig in its bill was observed on 26 February 2000 along the camp 1 transect at 110 m.
An extinction-risk assessment has not been added yet.