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Subspecies is abbreviated as subsp. or ssp. and the singular and plural forms are the same ("the subspecies is" or "the subspecies are"). In zoology , under the International Code of Zoological Nomenclature , the subspecies is the only taxonomic rank below that of species that can receive a name.
A variety of whistling and clicking calls have been described. Slight morphological differences have been observed between subspecies. A shy bird, the white-crowned forktail stays near water, and forages on the edges of rivers and streams for invertebrates. Its breeding season is between March and September, and possibly extends till October ...
For algae, fungi, plants, and their fossils, there is an indeterminate number of infraspecific ranks allowed below the level of species. The secondary ranks below the species rank are variety and forma, and more ranks can be made by using the prefix "sub" to make subspecies, subvariety, subforma. Very rarely even more forms are created, such as ...
Variety is defined in the code as follows: "Variety (varietas) the category in the botanical nomenclatural hierarchy between species and form (forma)". The code acknowledges the other usage as follows: "term used in some national and international legislation for a clearly distinguishable taxon below the rank of species; generally, in ...
The differences between subspecies are small, making subspecific boundaries hard to define, and the exact distribution of S. a. heineken is unclear, since birds from northwest Africa may be of this form. [13] About 2% of male blackcaps on Madeira and the Azores are melanistic, with black plumage on the whole head and upper breast. [14]
It is white, with a large yellow crest that it can raise. It is 45–55 cm (18–22 in) long, weighing 550–600 g (19–21 oz) and can live up to 40 years. [5] [6] This subspecies differs from the Australian greater sulphur-crested cockatoo in that it is smaller, with broader crest feathers and has a pale blue periophthalmic ring instead of white.
Both sexes have a white spot behind the eye. Both sexes also have a forked tail, but the male's is more deeply indented than the female's. The subspecies differ significantly in their plumage. [6] Males of the nominate subspecies have a glittering yellow-green forecrown that transitions through golden yellow to blue on the crown.
An exception is "subspecies", which has been assimilated into English along with "genus" and "species". It is conventional to abbreviate taxonomic ranks when used as connecting terms in a scientific name or a classification (and the difference between the two is important in botany).
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