Omnivore () is a consumption classification for animals that have the capability to obtain chemical energy and
from materials originating from
plant and
animal origin. Often, omnivores also have the ability to incorporate food sources such as
algae,
Fungus, and
bacteria into their diet as well.
Omnivores come from diverse backgrounds that often independently evolved sophisticated consumption capabilities. For instance, dogs evolved from primarily carnivorous organisms (Carnivora) while pigs evolved from primarily herbivorous organisms (Artiodactyla).
The variety of different animals that are classified as omnivores can be placed into further categories depending on their feeding behaviors. include Maned wolf and ;
All of these animals are omnivores, yet still fall into special niches in terms of feeding behavior and preferred foods. Being omnivores gives these animals more food security in stressful times or makes possible living in less consistent environments.
Etymology and definitions
The word
omnivore derives from the Latin
omnis (all), and
vora, from vorare, (to eat or devour), having been coined by the French and later adopted by the English in the 1800s.
Traditionally the definition for omnivory was entirely behavioral by means of simply "including both animal and vegetable tissue in the diet.
" In more recent times, with the advent of advanced technological capabilities in fields like
gastroenterology, biologists have formulated a standardized variation of omnivore used for labeling a species' actual ability to obtain energy and nutrients from materials.
This has subsequently conditioned two context specific definitions.
-
Behavioral: This definition is used to specify if a species or individual is actively consuming both plant and animal materials.
-
Physiological: This definition is often used in academia to specify species that have the capability to obtain energy and nutrients from both plant and animal matter.
The taxonomic utility of omnivore's traditional and behavioral definition is limited, since the diet, behavior, and
phylogeny of one omnivorous species might be very different from that of another: for instance, an omnivorous pig digging for roots and scavenging for fruit and carrion is taxonomically and ecologically quite distinct from an omnivorous
chameleon that eats leaves and insects. The term "omnivory" is also not always comprehensive because it does not deal with mineral foods such as
Mineral lick and the consumption of plant and animal material for medical purposes which would not otherwise be consumed (i.e.
zoopharmacognosy) within non-omnivores.
Classification, contradictions and difficulties
Though
Carnivora is a
taxon for species classification, no such equivalent exists for omnivores, as omnivores are widespread across multiple taxonomic
. The Carnivora order does not include all carnivorous species, and not all species within the Carnivora taxon are carnivorous.
It is common to find physiological carnivores consuming materials from plants or physiological herbivores consuming material from animals, e.g. felines eating grass and deer eating birds.
From a behavioral aspect, this would make them omnivores, but from the physiological standpoint, this may be due to
zoopharmacognosy. Physiologically, animals must be able to obtain both energy and nutrients from plant and animal materials to be considered omnivorous. Thus, such animals are still able to be classified as carnivores and herbivores when they are just obtaining nutrients from materials originating from sources that do not seemingly complement their classification. For instance, it is well documented that animals such as giraffes, camels, and cattle will gnaw on bones, preferably dry bones, for particular minerals and nutrients.
, which are usually regarded as obligate carnivores, occasionally eat grass to regurgitate indigestibles (e.g. hair, bones), aid with hemoglobin production, and as a laxative.
Occasionally, it is found that animals historically classified as carnivorous may deliberately eat plant material. For example, in 2013, it was considered that American alligators ( Alligator mississippiensis) may be physiologically omnivorous once investigations had been conducted on why they occasionally eat fruits. It was suggested that alligators probably ate fruits both accidentally but also deliberately.
"Life-history omnivores" is a specialized classification given to organisms that change their eating habits during their life cycle.[Maclean, Gordon Lindsay (1993). Roberts' Birds of Southern Africa. Publisher: New Holland. .] The same is true for many insects, such as beetles in the family Meloidae,[Skaife, S. H. (1953). African Insect Life. Pub. Longmans, Green & Co., London.] which begin by eating animal tissue as , but change to eating plant matter after they mature. Likewise, many mosquito species in early life eat plants or assorted detritus, but as they mature, males continue to eat plant matter and nectar whereas the females (such as those of Anopheles, Aedes and Culex) also eat blood to reproduce effectively.
Omnivorous species
General
Although cases exist of
eating meat and
eating
plant matter, the classification "omnivore" refers to the adaptations and main food source of the species in general, so these exceptions do not make either individual animals or the species as a whole omnivorous. For the concept of "omnivore" to be regarded as a scientific classification, some clear set of measurable and relevant criteria would need to be considered to differentiate between an "omnivore" and other categories, e.g.
faunivore,
folivore, and
scavenger.
Some researchers argue that evolution of any species from herbivory to carnivory or carnivory to herbivory would be rare except via an intermediate stage of omnivory.
Omnivorous mammals
Various
are omnivorous in the wild, such as species of
,
,
,
,
,
,
,
,
,
,
,
,
,
and
.
, including
and
, are also omnivores.
Most bear species are omnivores,
but individual diets can range from almost exclusively herbivorous to almost exclusively carnivorous, depending on what food sources are available locally and seasonally.
are classified as carnivores, both taxonomically (they are in the
Taxonomic rank Carnivora), and behaviorally (they subsist on a largely carnivorous diet). Depending on the species of bear, there is generally a preference for one class of food, as plants and animals are digested differently.
Wolf subspecies (including wolves,
,
, and
) have a general preference and are evolutionarily geared towards meat, but also will voluntarily eat plant material like fruits, vegetables, and grasses, and can live on such indefinitely.
Also, the
maned wolf is a canid whose diet is naturally 50% plant matter.
While most mammals may display "omnivorous" behavior patterns depending on conditions of supply, culture, season and so on, they will generally prefer a particular class of food, to which their digestive processes are adapted. Like most arboreal species, most squirrels are primarily granivores, subsisting on nuts and seeds.[Halle, S. & Stenseth, N. (2000). Activity patterns in small mammals: an ecological approach. Berlin; Heidelberg, Germany; New York: Springer-Verlag. p. 131.] But like virtually all mammals, squirrels avidly consume some animal food when it becomes available. For example, the American eastern gray squirrel has been introduced by humans to parts of Britain, continental Europe and South Africa. Where it flourishes, its effect on populations of nesting birds is often serious, largely because of consumption of eggs and nestlings.[Moller, H. (1983). "Food and foraging behaviour of red ( Scirus vulgaris) and grey ( Scirus carolinensis) squirrels". Mammal Review 13: 81-98.]
Other species
Various
are omnivorous, with diets varying from
berry and
nectar to
,
,
fish, and small
. Examples include
cassowary,
,
and related
corvidae,
,
rallidae, and rheas. In addition, some
,
, fish (such as
and
catfish), and
are also omnivorous.
Quite often, mainly herbivorous creatures will eagerly eat small quantities of animal food when it becomes available. Although this is trivial most of the time, omnivorous or herbivorous birds, such as sparrows, often will feed their chicks insects while food is most needed for growth.[Capinera, John (2010). Insects and Wildlife. Publisher: Wiley-Blackwell. .] On close inspection it appears that nectar-feeding birds such as sunbirds rely on the ants and other insects that they find in flowers, not for a richer supply of protein, but for essential nutrients such as cyanocobalamin that are absent from nectar. Similarly, monkeys of many species eat maggoty fruit, sometimes in clear preference to sound fruit.[Ewing, Jack (2005). Monkeys Are Made of Chocolate. Publisher: Pixyjack Press. .] When to refer to such animals as omnivorous, or otherwise, is a question of context and emphasis, rather than of definition.
See also
