How can we recognise house sparrows and barn swallows?
Let's compare the two well-known bird species.
Author: Horváthné Kunstár Andrea, Jámbor Gyuláné
sparrow, házi veréb, swallow, barn swallow, nidicolous, migratory bird, migrating bird, non-migratory bird, bird, birds, silhouette, aviation, feather, plumage, beak, leg, vertebrates, egg, brood, biology, nest, nature study, ecology, zoology
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