| amphibian(noun, feature, characteristic, animal, creature) | |
| bird(noun, entity, animal, creature, being) | |
| mammal(noun, entity, being, organism, life) | |
| predator | |
| Amniota | |
| amniote | |
| aquatic vertebrate | |
| bony case of the brain(noun, animal, group, backbone) | |
| fetus | |
| foetus | |
| gnathostome | |
| insect(nature, environment, being, world) | |
| mammalian | |
| primate(entity, animal, creature, fauna, being) | |
| reptile | |
| reptilian | |
| tetrapod | |
| cooing bird(animal, fauna, being, organism) | |
| rodent(animal, creature, fauna, being) |
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| APA | Smart Define. (2015). vertebrate thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/vertebrate/thesaurus/narrower |
| Chicago | Smart Define. 2015. "vertebrate thesaurus" https://smartdefine.org/vertebrate/thesaurus/narrower (accessed September 23, 2026). |
| Harvard | Smart Define 2015, vertebrate thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/vertebrate/thesaurus/narrower>. |
| MLA | Smart Define. "vertebrate thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/vertebrate/thesaurus/narrower> |