->''"The fauna of the Urals is very rich. More than 15,000 species of animals live here. For example, the mosquito alone is represented by 14,500 species."''
--> -- '''[[RussianHumour An old anecdote]]'''

There are a ''lot'' of different species of organisms in the world.

And a lot of them happen to look and behave very similarly to each other. Unfortunately, Hollywood thinks that any person who is sufficiently intelligent is also able to name any animal or plant they come across with its specific (and correct) Latin name, taxonomic history, and favorite color. In reality, unless you happen to be a foremost expert in studying that specific creature, it's unlikely that you could say anything more about it than "Hey that's a bug!".

This is especially wrong when dealing with bacteria or other microscopic organisms, since even though they may look similar at first glance, they could potentially belong to ''entirely different DOMAINS.'' And even microbes that are of the same species can look markedly different under different conditions.

With the advent of certain genetic techniques that allow scientists to specifically pin down what organism it is from analyzing its DNA, this is becoming somewhat more reasonable however, but such techniques also take time and significant computing power.

In the same vein, this is also when somebody sees Latin name and can automatically tell you the rest of its taxonomy from that information. If the character is already familiar with the species or genus, this makes sense, but since the Latin name only gives genus and species, and since even a person who knows Latin generally can't determine anything about an organism without context, it sticks out as serious research failure.

If this is only done with a single rare species, it can be viewed as just a rare bit of knowledge the person at hand happened to possess. Also, knowing your local flora and fauna often allows you to readily identify a plant or animal down to the subspecies, something that would be next to impossible if you did not know where the said plant or animal were collected. People who do a lot of hiking in a particular area would normally recognize the common species of plants and animals found in that area right away, regardless of any background in botany or biology.

Ultimately what classifies this as a HollywoodScience mistake is the assumption that ANYONE who is smart is able to identify a specific organism with uncanny accuracy by looking at a sample that is far too small or incomplete to normally reach that conclusion.

See also YouFailBiologyForever.

Contrast SmallTaxonomyPools.
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!!Examples:

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[[folder: Fan Fic ]]

* Col_Rutherford's "[[http://www.imdb.com/title/tt0367882/board/thread/146506319?d=146508542&p=2#146508542 revised script]]" of ''Film/IndianaJonesAndTheKingdomOfTheCrystalSkull'' changes Indy's line when he sees the carnivore ants from "Siafu!" to "''Paraponera clavata!''". According to the author, this is because siafu are from Africa, while the other are South American, [[MisplacedWildlife where the film takes place]]. Now, as to why would an archaeologist know how to identify ants to species level, let alone from a distance...

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[[folder: Film ]]

* ''InLikeFlint''. From microscopic traces Derek Flint is able to identify the residue of exotic flowers and herbs (styrax, ylang, mimosa, hyacinth, cannabis and Macedonian brawley).
* ''Film/JurassicPark'': Elly, a paleobotanist, knows from a cursory glance that a certain plant is extinct.
* In ''Film/DeepRising'', a character swiftly identifies the man-eating worms as to their broad taxonomic group and likely behavior, despite the fact that A) he's only seen the things for a few seconds, B) [[http://en.wikipedia.org/wiki/Ottoia the taxon in question]] is known only from fossils, and C) he's a freakin' ''cruise ship designer'', not a scientist!
** Amusingly, [[spoiler:he turns out to be COMPLETELY WRONG about what they are.]]
* In ''Film/HoneyIShrunkTheKids'', the tiny kids are running away from a gigantic lawn mower and jump into a hole in the ground. Nick immediately identifies the exact species of worm that made the tunnel (despite the worm not even being present). Possibly justified in that they are in his backyard and since he is a science geek, it's at least remotely possible that he knows what species of worm lives in their area.
* Averted in ''SilenceOfTheLambs'', in which identifying the species of an insect pupa found on the bodies of victims is a plot point, and the professional entomologist consulted needs time and equipment to answer the question.

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[[folder: Literature ]]

* Happens in many Creator/JulesVerne novels, where TheProfessor identifies and describes the characteristics of every plant or animal species the protagonists come across, as a means for Verne to [[ShownTheirWork show his work]].
** Back then, however, that was what a lot of people read books for, since there was no other means of learning about them save by actually going to see them.
** But the cake is taken by Conseil, a ''manservant'' to prof. Arronax in ''Literature/TwentyThousandLeaguesUnderTheSea''. The man was a living classification handbook.
* Slightly done in SherlockHolmes when he correctly identifies the lion's mane jellyfish as the killer of the victim when he sees it at the bottom of a small pool. Very much justified, however, in that this is one species which is very distinctive (it's really, really big) and that the victim's last words were "the lion's mane."
* Averted in one of BarbaraHambly's sequels to the ''Rising of the Dark''. One character can instantly identify a small animal from its bones, but he was highly trained in botany/zoology/magic and the question is: 'rabbit or chicken'.

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[[folder: Live Action TV ]]

* ''{{CSI}}'' proper typically justifies the insect portion of this as Grissom is an entomologist, but has been very guilty of this with regards to the flora.
** ''New York'' and ''Miami'' have not been so fortunate
* ''{{Bones}}'' once featured a character identifying a fungus to species from a few hyphal traces. This is impossible even for trained mycologists.
** And another time a person whose specialty was in ''art'' identified a specific species of fungal spores thanks to having a boyfriend who studied them. That this was actually accepted in court is a major case of HollywoodLaw.
** And then there is Hodgins, for which this trope essentially defines two-thirds of his job. The other third involves doing much the same, only with particulates. He ''is'' [=PhD=]-qualified for both of these, so it makes more sense than in many of these examples.
* ''CrossingJordan'' had a character (aptly nicknamed "Bug") dedicated to this trope. ANY time there were entomological traces found, ONE look was all he needed to tell what it was and how incredibly few but oh so conveniently dark and abandoned places it could be found.
* Subverted in ''TheBigBangTheory'' where Sheldon thinks he can identify the specific species of a cricket by its chirping. He was in fact wrong, as pointed out by Howard (who spent his youth collecting insects), though Sheldon refused to believe it. In the end they turned to an associate with a [=PhD=] in entomology to settle the dispute.
* Done in ''Series/{{Monk}}'' when a rival detective is able to identify a mosquito's type and genus, as well as point out that it only appears in a specific spot in the city. [[SubvertedTrope Subverted]] when it was revealed that he was just making it up.
* ''Film/TheBeast'', the TV-movie adaptation of PeterBenchley's giant-squid-on-the-rampage novel ''Literature/{{Beast}}'' has the resident scientist instantly identify the squid as ''Archetuthis dux'' from a single sucker-claw and a whiff of ammonia. Especially bad because ''Architeuthis'' the giant squid ''doesn't have claws''. (The colossal squid ''Mesonychoteuthis'' does, though.) And most deep sea squid have a lot of ammonia in their systems.


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[[folder: Video Games ]]

* In ''JaggedAlliance 2'', everyone has a comment on the monstrous and unearthly creatures you'll inevitably encounter if you tick the "Sci-Fi" option. Most mercenaries express various forms of surprise, but the medical doctors of your team will immediately start pinning down their taxonomy on first sight. (Crustacea, they seem to agree, which [[ReverseFunnyAneurysm amusingly]] makes them [[GiantEnemyCrab Giant Enemy Crabs]].)

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[[folder: Web Comics ]]

* In ''Webcomic/ElGoonishShive'', the principal of Moperville South High School apparently knows the taxonomic family of squirrels. Despite the fact that that is easily recognized by biologists, the fact that he and several others recognize the word "Sciuridae" with presumably little biology experience is notable.
* Professor Lostclock in ''Webcomic/HitmenForDestiny'' is able to name and describe the evolutionary history of more or less every animal in the multiverse.

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[[folder: Real Life ]]

* In 1839, Richard Owen was sent (among other things) a 6-inch bone fragment from Australia, which he identified as belonging to a previously-unknown-to-science extinct giant bird. This turned out to be the giant Dinornis or Moa.
** Owen actually was an example of the aforementioned "[=PhD=]-qualified taxonomist", who specialized in paleontology and comparative anatomy.
*** Not only that, Owen was world-renowned for being the best comparative anatomist of his generation. He was the ''only person in the world'' who could do this (at the time, anyway. The generation before him had Georges Cuvier, who invented the field of comparative anatomy. Owen was even known as "The British Cuvier").
* If you live in California it may be especially hard to identify what even birds or mammals are. Researchers there have gained the ire of the rest of the world by using genetic sequencing as evidence that local animals are in fact distinct species, even though there is no way to distinguish the species other than through genetic testing. Fortunately several reputable scientists have pointed out that genetic variation within the same species is normal and does not warrant creation of a new species, and these may go away in the near future.
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