Examlex
Birds that learn their song don't begin to learn it until they are old enough to begin singing.
Species
A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
Cat
A small domesticated carnivorous mammal with soft fur, a short snout, and retractile claws, widely kept as pets or for catching mice.
Animal
An organism that consumes organic material, generally equipped with specialized sensory organs and a nervous system, enabling it to quickly react to environmental cues.
Referent
An object, concept, or entity to which a word, term, or symbol refers.
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