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C. xanthurus is one of the "crowned" butterflyfishes. These form a group of largely allopatric species sharing the overall color pattern of dark forward-pointing chevrons on silvery hues, (usually) a black-and-white crown spot and yellow to red hindparts to a stunning degree; they differ in the exact combination of hues and some small pattern details.
Adults have long yellow legs and a long, thin, dark bill which has a slight upward curve and is longer than the head. The body is grey-brown on top and white underneath; the neck and breast are streaked with dark brown. The rump is white. It ranges in length from 29 to 40 cm (11 to 16 in) and in weight from 111 to 250 g (3.9 to 8.8 oz).
It is now generally accepted that the yellow-legged gull is a full species, but until recently there was much disagreement. For example, British Birds magazine split the yellow-legged gull from the herring gull in 1993 but included the Caspian gull in the former, [3] but the BOU in Great Britain retained the yellow-legged gull as a subspecies of the herring gull until 2007. [4]
Adults also have a pale blue shield on their forehead, which connects with the red and yellow bill. Darkness or low light can dim the bright purple-blue plumage of the adult to make them look dusky or brownish, although the forehead shield color differentiates them from similar species such as common gallinules. Immature purple gallinules are a ...
The yellow-legged frogs remained abundant in only about 20% of the most remote, unstocked lakes. But even that changed after World War II. “All these pilots are coming back with very, very ...
The European hornet (V. crabro) is the best-known species, widely distributed in Europe (but is never found north of the 63rd parallel), and European Russia (except in extreme northern areas). In the east, the species' distribution area stretches over the Ural Mountains to western Siberia (found in the vicinity of Khanty-Mansiysk ).
The yellow-legged hornet, identified as Vespa velutina, comes from Southeast Asia. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
The presence of the invasive and predatory yellow-legged hornet, native to southeast Asia, has been confirmed near Savannah, Georgia. The hornets pose a threat to honeybee populations.