Gadwall vs koala

Mareca strepera compared with Phascolarctos cinereus

Key Differences

• Gadwall is Least Concern while koala is Vulnerable.

Taxonomic Classification

Rank	Gadwall	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	Aves (鳥綱)	Mammalia (哺乳動物)
Order	Anseriformes (雁形目)	Diprotodontia (雙門齒目)
Family	Anatidae	Phascolarctidae (Koalas)
Genus	Mareca	Phascolarctos (Koalas)
Species	Mareca strepera	Phascolarctos cinereus

Evolutionary Relationship

Gadwall and koala share a common ancestor at the Phylum level: Chordata. (脊索动物门)

Conservation Status

Gadwall

LC — Least Concern

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Gadwall	koala
Diet	—	Herbivore
Average Lifespan	—	15 years
Average Length	—	75 cm
Average Weight	—	10.0 kg

Habitat & Geographic Range

Gadwall

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), North America (United States), and South America (Colombia).

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.

Gadwall

赤膀鸭（Mareca strepera）在IUCN红色名录中被列为无危（LC）。在整个分布范围内广泛分布且数量丰富，种群稳定，无直接的保护关注。

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。