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species
/ˈspiːsiːz/
The word 'species' is primarily used as a noun. In biology, it refers to a specific taxonomic rank. It is an uncountable noun when referring to the general concept of a type or kind (e.g., 'What species of bird is that?'). However, it can be used countably when referring to distinct types (e.g., 'several species of flowers'). It is generally considered standard English and is not particularly formal or informal, though its use in everyday conversation might be less frequent than in scientific or academic contexts.
💬Casual Conversation
This new client is a whole different species. I can't make heads or tails of these notes.
Just pivot the strategy. We need to leverage our synergy here.
Meanings
A group of living organisms that can reproduce with one another and produce fertile offspring, constituting a fundamental category of taxonomic classification.
"The species is endangered."
Examples
We need to protect every endangered species on the list.
I honestly think he is a whole new species of liar!
Is this species of orchid common in your region?
Stop it! You are behaving like some strange, alien species!
The scientist identified a previously unknown species of beetle.
Look at him... he is just some rare species of weirdo.
Many species are struggling to survive the current climate shift.
Seriously, what species of person actually enjoys this traffic?
Collocations & Compounds
endangered species
A species at serious risk of extinction.
We must protect endangered species.
extinct species
A species that no longer has any living members.
Dinosaurs are an extinct species.
new species
A species that has recently been discovered or identified.
Scientists found a new species in the deep sea.
human species
The species Homo sapiens, comprising modern humans.
The human species has spread globally.
native species
A species that originates or naturally occurs in a particular place.
Protecting native species is crucial.
Idioms & Sayings
a different species
Used to describe someone or something that is completely different from others.
His approach to problem-solving is a different species.
a peculiar species
Used humorously to describe a person with odd or unusual characteristics.
He's really a peculiar species, isn't he?
Cultural Context
For most people, the concept of a "species" seems straightforward—a dog is a dog, and a cat is a cat. However, in the realm of professional biology, there exists what is known as the "Species Problem." This refers to the humbling realization that scientists cannot actually agree on a single, universal definition of what a species truly is.
The most famous attempt to define it is the Biological Species Concept (BSC), which posits that a species consists of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring. While this works beautifully for mammals or birds, it falls apart completely when we look at the rest of the tree of life. For instance, how do you define a species for an asexual bacterium that simply clones itself? Or for ancient plants that hybridize wildly across borders?
Furthermore, the discovery of "cryptic species" has added another layer of complexity. These are organisms that look identical to the naked eye—morphologically indistinguishable—but are genetically distinct and cannot interbreed. This means that a single perceived species might actually be five or six different ones hiding in plain sight, separated by millions of years of evolutionary divergence.
Then there is the philosophical tension between "lumpers" and "splitters." Lumpers prefer a broad definition, grouping similar organisms together to emphasize shared ancestry. Splitters, on the other hand, look for every minute genetic or behavioral difference to carve out new classifications.
This debate isn't just academic pedantry; it has massive real-world implications for conservation. If we cannot agree on what constitutes a distinct species, how do we decide which populations are "endangered" and deserve legal protection? The Species Problem teaches us that nature does not fit neatly into the boxes humans create. Evolution is a fluid, continuous gradient of change, and our attempt to slice that gradient into discrete categories is an act of human convenience rather than biological reality.
Etymology
The word 'species' comes from Latin, meaning 'appearance', 'sort', or 'kind'. It was first used in English in the late 16th century to refer to a particular kind or sort of thing. In the 17th century, its biological meaning began to develop, referring to a group of organisms sharing common characteristics. This biological sense was popularized by scientists like John Ray and Carl Linnaeus, who used it as a fundamental unit in their systems of classification. Linnaeus, in particular, established the binomial nomenclature system where 'species' became the second part of a scientific name (e.g., Homo sapiens). The term's usage evolved from a general concept of 'kind' to a precise scientific category based on reproduction and shared characteristics.