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Animals That Start With “J”

Browse 7 verified species whose common names begin with the letter J.

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Jacana

AvesAnimal group

Jacana

Jacanidae

Diet: Mostly aquatic invertebrates plus seeds and plant material
Wild lifespan: Species-specific; no reliable family-wide figure

Jaguar

Jaguar

Panthera onca

Diet: Carnivore
Wild lifespan: Often 10–15 years in the wild

Japanese Beetle

Japanese Beetle

Popillia japonica

Diet: Herbivore
Wild lifespan: Usually one generation per year; adults live several weeks

Japanese Rat Snake

Japanese Rat Snake

Elaphe climacophora

Diet: Carnivorous constrictor of small vertebrates
Wild lifespan: Often 10–15 years in the wild; managed individuals may exceed 20 years

Jaragua Dwarf Gecko

Jaragua Dwarf Gecko

Sphaerodactylus ariasae

Diet: Tiny invertebrate predator
Wild lifespan: No dependable wild lifespan estimate is available

Jellyfish

Multiple medusozoan classesAnimal group

Jellyfish

Medusozoa

Diet: Carnivore
Wild lifespan: From weeks to several years, depending on species and life stage

Joro Spider

Joro Spider

Trichonephila clavata

Diet: Insectivore
Wild lifespan: One annual generation; adults die after the autumn breeding season in the documented U.S. range