a flock of puffins (apus affinis), a population from sub-saharan africa in europe.

puffin puffins chimney swift flock flight sky bird ornithology birds migratory chaetura pelagica early evening urban flying cloud air wings wing clouds view house genus apusapus marmot order apodiformes city trees animal baby adult protected nature environment prague europe wild population park living spring summer nesting animals natural seasonal arrival season background