Portal:Biology/Featured picture

Selected images for the Biology portal.

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The African bullfrog (Pyxicephalus adspersus) is a species of frog in the family Pyxicephalidae.

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The griffon vulture (Gyps fulvus) is a large Old World vulture in the bird of prey family Accipitridae. It is also known as the Eurasian griffon.

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An embryo is a

hatching, or germination. In humans, it is called an embryo until about eight weeks after fertilization (i.e. ten weeks after the last menstrual period

or LMP)

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cartilaginous fish in the order Chimaeriformes, known informally as ghost sharks, ratfish, spookfish, or rabbitfishes. They grow up to 150 cm (4.9 ft) in length, and have elongated, soft bodies, with a bulky head and a single gill-opening. For defense, most chimaeras have a venomous spine located in front of the dorsal fin. At one time a "diverse and abundant" group (based on the fossil record), their closest living relatives are sharks, though in evolutionary

terms they branched off from sharks nearly 400 million years ago and have remained isolated ever since, typically confined to deep water.

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The platypus (Ornithorhynchus anatinus) is a
related species have been found in the fossil record. The bizarre appearance of this egg-laying, venomous, duck-billed, beaver-tailed, otter
-footed mammal baffled European naturalists when they first encountered it, with some considering it an elaborate fraud.

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The Warbler Finch (Certhidea olivacea) is the only member of the
Thraupidae. Darwin had mistakenly thought it was a wren, but, on return to England, was informed in March 1837 by the ornithologist John Gould
that the bird belonged to the group of finches.

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Naja naja or the Indian cobra is a
snake charmers
. It is now protected in India under the Indian Wildlife Protection Act (1972).

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The
USA, in Monterey Bay
. The bell (body) of the jellyfish is up to 70 cm in diameter, typically with a radial pattern of stripes. The tentacles vary with the age of the individual, consisting typically of eight marginal long dark arms, and four central, frilly, oral arms.

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dragonflies and damselflies. Their development takes place in freshwater and typically takes a year. During that time, they are known as "nymphs
". The adults are short-lived, from a few hours to a few days depending on the species. About 2,500 species are known worldwide. Depicted here is a female subimago of the March Brown, Rhithrogena germanica, which is a faunistic rarity and on the red list of endangered species.

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dragonflies and damselflies. Their development takes place in freshwater and typically takes a year. During that time, they are known as "nymphs
". The adults are short-lived, from a few hours to a few days depending on the species. About 2,500 species are known worldwide. Depicted here is a female subimago of the March Brown, Rhithrogena germanica, which is a faunistic rarity and on the red list of endangered species.

The plant shown is a horsetail, Equisetum arvense.

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Photo credit: Keith Weller (
USDA
)

U.S. corn, the Germplasm Enhancement for Maize (GEM) project seeks to combine exotic germplasm, such as this unusually colored and shaped maize from Latin America
, with domestic corn lines.

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Photo credit: BS Thurner Hof

A male traits
.

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Photo credit: Janek Pfeifer

A mating pair of European or
Common Toads (Bufo bufo) occupying the position known as amplexus. This is indeed a common toad, with a range that includes North Africa, Europe except Ireland, and across North Asia into Siberia
. In some regions, toads are threatened by roads disrupting their spawning migrations, and in many places, tunnels have been built to allow them to cross roads.

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Photo credit: Mariana Ruiz Villarreal

Two Centrosauri in an artist's impression of male combat.

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Photo credit: Exlibris

The
vibrissae of a culpeo (Pseudalopex culpaeus), sometimes known as the Patagonian fox, a South American canid
.

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Photo credit: Ksoth

A Panther chameleon (Furcifer pardalis) from Nosy Be, Madagascar, displaying mating colors.

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Photo credit: Bernard Landgraf

The Red Panda (Ailurus fulgens) is a small bear-like mammal native to the Himalayas and southern China.

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stamens

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A crab from the genus Mictyris that lives in the Indo-Pacific region.

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Two flies of the family Anthomyiidae mating.

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Three types of
binary fission and two more complicated types that either involve mitosis or meiosis
.

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Fruit of the
Horse Chestnut tree. The dried seeds are often used in the English children's game: Conker
.

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A female
Superb Fairy-wren (Malurus cyaneus), seen here perched on barbed wire. This bird is native to Australia

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A furry bumblebee gathers pollen.

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Compound eye of the Antarctic krill Euphausia superba

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A Caribbean Reef Squid (Sepioteuthis sepioidea), part of the family Loliginidae.

A Caribbean Reef Squid (Sepioteuthis sepioidea), part of the family Loliginidae.

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A polydactyl human hand.

A
human
hand.

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An Antarctic Icefish (family Channichthyidae).

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Two
North American River Otters
(Lontra canadensis)

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A
Chinstrap Penguin
hunting for krill (Pygoscelis antarctica)

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Side view of the
Yellow-winged Darter
(Sympetrum flaveolum)

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