In an often misquoted passage from On the Origin of Species, Charles Darwin appears to acknowledge the eye's development as a difficulty for his theory.

It is often incorrectly assumed that he insisted that the rate of change must be constant, or nearly so, but even the first edition of On the Origin of Species states that " Species of different genera and classes have not changed at the same rate, or in the same degree.

* The starting points, the time from which these codes are in effect ( retroactively ), vary from group to group. In botany the starting point will often be in 1753 ( the year Carl Linnaeus first published Species Plantarum ).

Species often have different mating or courtship patterns or behaviors, the breeding seasons may be distinct and even if mating does occur antigenic reactions to the sperm of other species prevent fertilization or embryo development.

** Species stratus fractus ( St fra ): A ragged broken up sheet of St that often forms in precipitation ( C < sub > L </ sub > 7 ) falling from a higher cloud deck.

Species in Araceae are often rhizomatous or tuberous and are often found to contain calcium oxalate crystals or raphides.

Species such as titan arum and the dead horse arum give off a very pungent smell, often resembling a rotten animal, to attract flies to pollinate the plant.

Species in the related genus Schizophragma, also in Hydrangeaceae, are also often known as hydrangeas.

Species with dull coloured eyes often sport contrasting eyerings.

Species which burrow or live in dry or mountainous areas are often matte brown above ( e. g. Sand Martin and Crag Martin ).

Species breeding in more tropical areas are often more sedentary, although several tropical species are partial migrants or make shorter migrations.

Species named bitterns tend to be the shorter-necked, often more secretive members of this family.

Although often dismissed as a lightweight forerunner of Charles Darwin's The Origin of Species, Chambers ' book was in reality a programme for the unification of science which aimed to show that Laplace's nebular hypothesis for the origin of the solar system and Lamarck's theory of species transformation were both instances ( in Lewes ' phrase ) of ' one magnificent generalization of progressive development.

The compositions of groups such as Jamiroquai, Galliano, Urban Species, The Brand New Heavies and Incognito often feature chord structures usually associated with jazz music.

Examples include Michael Faraday, who, with James Clerk Maxwell, unified the electric and magnetic forces in what are now known as Maxwell's equations ; James Joule, who worked extensively in thermodynamics and is often credited with the discovery of the principle of conservation of energy ; Paul Dirac, one of the pioneers of quantum mechanics ; naturalist Charles Darwin, author of On the Origin of Species and discoverer of the principle of evolution by natural selection ; Harold Kroto, the discoverer of buckminsterfullerene ; William Thomson ( Baron Kelvin ) who drew important conclusions in the field of thermodynamics and invented the Kelvin scale of absolute zero ; botanist Robert Brown discovered the random movement of particles suspended in a fluid ( Brownian motion ); and the creator of Bell's Theorem, John Stewart Bell.

Species of Suillus are considered by many to be slimy and insipid, however, in Russia, they are often pickled and even sold commercially this way.

Species that feed in the open, far from cover, or are conspicuous by their behaviour or coloration, are taken more often by Eurasian Sparrowhawks.

Species taken most often are northern flying squirrels and woodrats, including dusky-footed, bushy-tailed, ( N. cinerea ), and Mexican woodrats ( N. mexicana ).

Evolutionary biologists often define species as populations that do not interbreed with each other ( the Biological Species Concept ), and thus the benthics and limnetics within each lake would constitute separate species.

Species of this genus are often found clambering over other plants, or climbing the trunks of trees with the aid of aerial roots.

Species often seen include ; badgers, hares, roe deer, foxes, rabbits and owls.

Species in their natural habitat are often far more complex than the typical text-book examples.

Herbert Spencer first used the phrase – after reading Charles Darwin's On the Origin of Species – in his Principles of Biology ( 1864 ), in which he drew parallels between his own economic theories and Darwin's biological ones, writing, " This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called ' natural selection ', or the preservation of favoured races in the struggle for life.

Herbert Spencer first used the phrase — after reading Charles Darwin's On the Origin of Species — in his Principles of Biology of 1864 in which he drew parallels between his economic theories and Darwin's biological, evolutionary ones, writing, “ This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called ' natural selection ', or the preservation of favoured races in the struggle for life.

When Darwin wrote On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, the oldest animal fossils were those from the Cambrian Period, now known to be about 540 million years old.

Species that were once common but now are gone or endangered include the Southwestern Willow Flycatcher, Western Yellow-billed Cuckoo, Least Bell's Vireo, and Warbling Vireo.

Species of both genera are native to the area where Greek language and culture originated, though as the word " kedros " does not seem to be derived from any of the languages of the Middle East, it has been suggested the word may originally have applied to Greek species of juniper and was later adopted for species now classified in the genus Cedrus because of the similarity of their aromatic woods.

In his Origin of Species, Darwin mentions that, like many others at the time, he thought that changed habits produce an inherited effect, a concept now known as Lamarckism.

Charles Darwin underwent hydropathic treatment at Wells House when his book On the Origin of Species was published on 24 November 1859, whilst staying with his family North View House ( now Hillside Court ).

All species of the genus Guaiacum are now listed in Appendix II of CITES ( the Convention on International Trade in Endangered Species of Wild Fauna and Flora ) as potentially endangered species.

Species formerly in Prinia but now considered distinct enough to warrant separate generic treatment:

Species in the genera Tityra, Pachyramphus, Laniocera and Xenopsaris were formerly placed in this family, but evidence suggested they belong in their own family, the Tityridae, where they are now placed by SACC.

* Charles Darwin started the " abstract " which became the Origin of Species at the King's Head Hotel ( now Bar ) in Sandown in mid-July 1858.

Wild goldenseal is now so rare that the herb is listed in the Convention on International Trade in Endangered Species of Wild Fauna and Flora ( CITES ) goldenseal is one of the most overharvested herbs.

Species formerly included in wider views of the genus are now included in such separate genera as Fatsia, Macropanax, Oreopanax, Panax, Polyscias, Pseudopanax, Schefflera, and Tetrapanax.

Major responsibilities of the NFHS, besides mentioned fish propagation, now include helping to recover species listed under the Endangered Species Act, restoring native aquatic populations, mitigating for fisheries lost as a result of federal water projects, and providing fish to benefit Indian tribes and National Wildlife Refuges.

Woolly monkeys are now considered highly endangered, and captive individuals are bred to ensure the survival of the species as part of the International Breeding Program for Endangered Species.

Species in the genus may be referred to as " pipistrelles " or " pipistrelle bats ", though these terms are also used for species now placed in other genera, such as the western pipistrelle ( Parastrellus hesperus ) and eastern pipistrelle ( Perimyotis subflavus ) of North America.

Species of the genus Aegialites ( or Aegialitis ) are now subsumed within Charadrius.

It is now reported extinct, even if it was never listed on the Endangered Species Act.

Species in family Podocarpaceae have been reshuffled a number of times based on genetic and physiological evidence, with many species formerly assigned to genus Podocarpus now assigned to other genera.

It is now buried outside the entrance of Nickelodeon Suites Resort, also in Orlando, contained items deemed important to the children of 1992 as voted upon by Nickelodeon viewers, including bubble gum, a skateboard, a history book, a comic book, a phone book, a world atlas, news reports from Desert Storm, news reports from the AIDS Crisis, news reports from the end of the Soviet Union, a Home Alone VHS, a Back to the Future VHS, assorted photographs of bicycles, trains, cars, politicians, and celebrities, a piece of the Berlin Wall, lead pencils, the Orlando, Florida TV Guide from the week of April 30, 1992, a baseball, a Barbie Doll, a Nintendo Game Boy, a Nicktoons t-shirt, Michael Jackson CDs, MC Hammer CDs, Twinkies, an issue of Nickelodeon Magazine, Rollerblades, a can of Nickelodeon Gak, Reebok Pump sneakers, and a copy of the Book of Endangered Species.

The event is now considered by Marvel editors as the first part of a long series of events, which includes House of M, Decimation, Planet Hulk, Civil War, The Initiative, Endangered Species, World War Hulk, Messiah Complex, Divided We Stand, Secret Invasion, Manifest Destiny, Dark Reign, Messiah War, Utopia, Nation X and Necrosha.

" Sawfishes are now protected under the highest protection level of the Convention on International Trade in Endangered Species ( CITES ), Appendix I, but given the great volume of the shark fin trade, and that detached shark fins are difficult to identify, it is unlikely that CITES protection will prevent sawfish fins from entering the trade.

However, the negative trend has not persisted, and both species are now listed as Species of Least Concern.

Note: Species of Deleya and Halovibrio are now now Halomonas