delichon การใช้

• The " Delichon " martins have simple flight calls of one to three notes.
• Birds of the " Delichon " species are most vulnerable when collecting mud from the ground.
• The " Delichon " martins were originally cliff nesters, breeding in colonies situated under an overhang on a vertical cliff.
• Although the three " Delichon " martins are similar in appearance, only " D . urbicum " has a pure white rump and underparts.
• The two other house martins were moved to " Delichon " from the genus " Chelidon " in which they had been placed up to that time.
• The frequency of this hybrid has led to suggestions that " Delichon " is not sufficiently separated genetically from " Hirundo " to be considered a separate genus.
• ""'Delichon " "'is a small genus of passerine birds that belongs to the swallow family and contains three species named as house martins.
• The genus " Delichon " is a recent divergence from the barn swallow genus " Hirundo ", and its three members are similar in appearance with blue upperparts, a contrasting white-rump, and whitish underparts.
• The genus " Delichon " was created by American naturalist Thomas Horsfield and British entomologist Frederic Moore in 1854 to accommodate the Nepal house martin that was first described by Moore in the same year, and is therefore the type species for the genus.
• These groups are the " core martins ", including burrowing species like the sand martin, the " nest-adopters ", which are birds that utilise natural cavities, and the " mud nest builders " such as the " Delichon " house martins.
• Its brown back, white throat, small size and quick jerky flight separate it at once from similar swallows, such as the common house martin ( " Delichon urbicum " ), the American cliff swallow ( " Petrochelidon pyrrhonota " ) or other species of " Riparia ".
• "Ptyonoprogne " is closely related to the larger swallow genus " Hirundo " into which it is often subsumed, but a DNA analysis showed that an enlarged " Hirundo " genus should logically contain all the mud-builder genera, including the " Delichon " house martins, a practice which few authorities follow.
• It is believed that the evolutionary sequence is from species that make open cup nests ( " Hirundo " and " Ptyonoprogne " ), through " Delichon " house martins with closed nests, to " Cecropis " and " Petrochelidon ", which have retort-like closed nests with an entrance tunnel.
• The " Ptyonoprogne " species construct open mud nests and therefore belong to the last group . " Hirundo " species also build open nests, " Delichon " house martins have a closed nest, and the " Cecropis " and " Petrochelidon " swallows have retort-like closed nests with an entrance tunnel.
• The " Ptyonoprogne " species construct an open mud nest and therefore belong to the last group; " Hirundo " species also build open nests, " Delichon " house martins have a closed nest, and the " Cecropis " and " Petrochelidon " swallows have retort-like closed nests with an entrance tunnel.
• The " Ptyonoprogne " species construct an open mud nest and therefore belong to the latter group; " Hirundo " species also build open nests, " Delichon " house martins have a closed nest, and the " Cecropis " and " Petrochelidon " swallows have retort-like closed nests with an entrance tunnel.
• The genus " Ptyonoprogne " is closely related to the larger swallow genus " Hirundo " into which it is often subsumed, but a DNA analysis showed that an enlarged " Hirundo " genus should contain " all " the mud-builder genera, including the " Delichon " house martins, a practice which few authorities follow.
• Although the nests of the " Ptyonoprogne " crag martins resembles those of typical " Hirundo " species like the barn swallow, the research showed that if " Delichon ", " Cecropis " and " Petrochelidon " are split from " Hirundo ", " Ptyonoprogne " should also be treated as a separate genus.
• Although the nests of the " Ptyonoprogne " crag martins resembles those of typical " Hirundo " species like the barn swallow, the research showed that if " Delichon ", " Cecropis " and " Petrochelidon " are split from " Hirundo ", " Ptyonoprogne " should be also considered as a separate genus.
• Although the nests of the " Ptyonoprogne " crag martins resembles those of typical " Hirundo " species like the barn swallow, the DNA research suggested that if the " Delichon " house martins are considered to be a separate genus, as is normally the case, " Cecropis ", " Petrochelidon " and " Ptyonoprogne " should also be split off.