Chimney swifts and swallows are two types of birds that are often confused with each other. While they share some similarities, such as their small size and their ability to fly quickly, there are also some key differences between them.
Importance and benefits
The pallid swift (_Apus pallidus_) and common swift (_Apus apus_) are two closely related species of swifts that breed in Europe, Asia, and Africa. Despite their similar appearance, there are a number of key differences between the two species.
One of the most obvious differences between the pallid swift and common swift is their size. The pallid swift is slightly larger than the common swift, with a wingspan of 34-38 cm compared to 32-36 cm. The pallid swift also has a longer tail than the common swift, with a length of 10-12 cm compared to 8-10 cm.