brown-throated three-toed sloth vs koala

Bradypus variegatus compared with Phascolarctos cinereus

Key Differences

• brown-throated three-toed sloth is Least Concern while koala is Vulnerable.
• koala is 2.5x heavier than brown-throated three-toed sloth.
• brown-throated three-toed sloth lives longer (30 years vs 15 years).

Taxonomic Classification

Rank	brown-throated three-toed sloth	koala
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class same	Mammalia (哺乳動物)	Mammalia (哺乳動物)
Order	Pilosa (披毛目)	Diprotodontia (雙門齒目)
Family	Bradypodidae (Three-toed Sloths)	Phascolarctidae (Koalas)
Genus	Bradypus (Three-toed Sloths)	Phascolarctos (Koalas)
Species	Bradypus variegatus	Phascolarctos cinereus

Evolutionary Relationship

brown-throated three-toed sloth and koala share a common ancestor at the Class level: Mammalia. (哺乳動物)

Conservation Status

brown-throated three-toed sloth

LC — Least Concern

Trend: Stable →

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	brown-throated three-toed sloth	koala
Diet	Herbivore	Herbivore
Average Lifespan	30 years	15 years
Average Length	60 cm	75 cm
Average Weight	4.0 kg	10.0 kg

Habitat & Geographic Range

brown-throated three-toed sloth

Habitat

Typically found in grasslands, forests, and vegetated habitats.

Range

Distributed across Colombia, Ecuador, and Venezuela.

koala

Habitat

Typically found in grasslands, forests, and vegetated habitats.

Range

Found in Australia. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

brown-throated three-toed sloth

棕喉三趾树懒是世界上行动最缓慢的哺乳动物之一，倒挂于中南美洲热带雨林的林冠层，平均时速仅0.24公里。其低代谢率是对营养贫乏的叶片食性的关键适应。毛皮中生长的藻类提供伪装，并可能携带具有抗菌特性的共生真菌。蛾、甲虫和真菌在树懒毛皮中形成一个微型生态系统。

koala

澳大利亚东部和东南部的标志性有袋类动物，体重最大可达15千克，为了节省低热量桉树叶食物所提供的能量，每天最多睡眠22小时。高度特化，能够处理会致大多数其他哺乳动物死亡的有毒桉树成分，拥有专门适应解毒功能的肠道微生物群。因衣原体病、栖息地开发和气候变化导致种群锐减，2022年被列为濒危物种。