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Delichon urbicum. The western house martin (Delichon urbicum), sometimes called the common house martin, northern house martin or, particularly in Europe, just house martin, is a migratory passerine bird of the swallow family which breeds in Europe, north Africa and across the Palearctic; and winters in sub-Saharan Africa and tropical Asia.
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The juvenile plumage (held by young birds for their first few months after fledging) is very similar to that of adults, but with whitish tips to the outer webs of the secondaries and tertials. [20] The chimney swift's wings are slender, curved and long, [21] extending as much as 1.5 in (3.8 cm) beyond the bird's tail when folded. [22]
The search for patterns in the variations of birds was attempted by many. Friedrich Wilhelm Joseph Schelling (1775–1854), his student Johann Baptist von Spix (1781–1826), and several others believed that a hidden and innate mathematical order existed in the forms of birds.
These birds appear from the tiles of the landscape and become more detailed towards the extremes of the woodcut. Along the center, the image is divided into complementary black (right) and white (left), or, as the title suggests, day and night.
They are known for their speed, agility, and their characteristic mix of rapid, flapping, and gliding flight patterns. When approaching their nesting site, they will dive from the sky at great speeds with their wings tucked, just like the peregrine falcon does when hunting smaller birds.
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