T
This collection of terms and their definitions should help as you try to understand the vast language that has developed for the study of animals. Terms in this category begin with the letter 'T'.
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Please refer to the Glossary Citations page for details about sources used for glossary entries.
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Please refer to the Glossary Citations page for details about sources used for glossary entries.
Tonian Period
Tonian Period
Tonian Period
Threatened Species
A threatened species is a native species that is at risk of becoming endangered in the near future.
A threatened species is a native species that is at risk of becoming endangered in the near future.
Torsion
A twisting process that gastropods undergo during their development in which the position of their visceral and pallial organs are repositioned by 180°. The resulting arrangement of body parts in the gastropod is therefore assymmetrical.
A twisting process that gastropods undergo during their development in which the position of their visceral and pallial organs are repositioned by 180°. The resulting arrangement of body parts in the gastropod is therefore assymmetrical.
Taiga
"Ecological zone south of the tundra and north of the temperate zone, dominated by conifer trees and harsh winters." (Source: Sibley)
"Ecological zone south of the tundra and north of the temperate zone, dominated by conifer trees and harsh winters." (Source: Sibley)
Tail Slapping
Dolphins can be seen slapping their tails forcibly on the surface of the water.
Dolphins can be seen slapping their tails forcibly on the surface of the water.
Tarsus
"The lower leg. The major bone in this region of the leg is the tarsometatarsus, which is a fusion of structures called ankle and foot bones in mammals. The avian equivalent of the mammalian lower leg bones (the tibia and fibula) is found in the 'drumstick' or what appears to be the upper leg in most birds." (Source: Sibley)
"The lower leg. The major bone in this region of the leg is the tarsometatarsus, which is a fusion of structures called ankle and foot bones in mammals. The avian equivalent of the mammalian lower leg bones (the tibia and fibula) is found in the 'drumstick' or what appears to be the upper leg in most birds." (Source: Sibley)
Taxon
"A unit used in grouping and naming living organisms; a general term that can refer to any level of a taxonomic classification." (Source: Sibley)
"A unit used in grouping and naming living organisms; a general term that can refer to any level of a taxonomic classification." (Source: Sibley)
Taxonomic Classification
"Hierarchical system for grouping and naming types of living organisms." (Source: Sibley)
"Hierarchical system for grouping and naming types of living organisms." (Source: Sibley)
Taxonomy
The classification of organisms on the basis of their evolutionary relationships.
The classification of organisms on the basis of their evolutionary relationships.
Territory
A particular area defended by an individual against intrusion by other individuals, particularly of the same species.
A particular area defended by an individual against intrusion by other individuals, particularly of the same species.
Thorax
In mammals, the part of the trunk anterior to the diaphragm, which partitions it from the abdomen. In insects, the body region between the head and the abdomen, bearing the walking legs and wings.
In mammals, the part of the trunk anterior to the diaphragm, which partitions it from the abdomen. In insects, the body region between the head and the abdomen, bearing the walking legs and wings.
Trachea
In vertebrates, the part of the respiratory system running from the pharynx into the thorax; the 'windpipe'. In land arthropods, an air duct running from an opening in the body wall to the tissues.
In vertebrates, the part of the respiratory system running from the pharynx into the thorax; the 'windpipe'. In land arthropods, an air duct running from an opening in the body wall to the tissues.
Triangulation
"A technique fdor finding a position, often of prey, by means of taking bearings from two or more fixed points. Some species (somne owls, harriers) have asymmetrical ear openings that improve triangulation using sound." (Source: Sibley)
"A technique fdor finding a position, often of prey, by means of taking bearings from two or more fixed points. Some species (somne owls, harriers) have asymmetrical ear openings that improve triangulation using sound." (Source: Sibley)
Tribe
"A taxon that is a subset of a subfamily and that contains one or more genera." (Source: Sibley)
"A taxon that is a subset of a subfamily and that contains one or more genera." (Source: Sibley)
Tubenoses
"Colloquial name for members of the order Procellariiformes, which includes the albatrosses, the shearwaters and petrels, and the storm petrals." (Source: Sibley)
"Colloquial name for members of the order Procellariiformes, which includes the albatrosses, the shearwaters and petrels, and the storm petrals." (Source: Sibley)
Tuberculate
Covered in raised, fleshy protuberances.
Covered in raised, fleshy protuberances.
Turtle
Freshwater or marine chelonian.
Freshwater or marine chelonian.
Tympanic Membrane
A membrane of the ear that picks up vibrations from the air and transmits them to other parts of the ear; the eardrum.
A membrane of the ear that picks up vibrations from the air and transmits them to other parts of the ear; the eardrum.