Common Water Rat vs elk

Hydromys chrysogaster compared with Cervus elaphus

Key Differences

• Common Water Rat is Least Concern while elk is Vulnerable.

Taxonomic Classification

Rank	Common Water Rat	elk
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Rodentia (Rodents)	Artiodactyla (Even-toed Ungulates)
Family	Muridae (Mice & Rats)	Cervidae (Deer)
Genus	Hydromys	Cervus (True Deer)
Species	Hydromys chrysogaster	Cervus elaphus

Evolutionary Relationship

Common Water Rat and elk share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

Common Water Rat

LC — Least Concern

elk

VU — Vulnerable

Trend: Stable →

Physical Characteristics

Attribute	Common Water Rat	elk
Diet	—	Herbivore
Average Lifespan	—	20 years
Average Length	—	2.1 m
Average Weight	—	240.0 kg

Habitat & Geographic Range

Common Water Rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

elk

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and temperate broadleaf and mixed forests, among 12 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (South Africa), Asia (Afghanistan, Indonesia), Europe (11 countries), North America (Mexico), Oceania and the Pacific (Australia, New Zealand), and South America (Argentina, Chile, Peru). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Water Rat

<em>Hydromys chrysogaster</em>, commonly known as the common water rat or rakali, is a semi-aquatic rodent in the family Muridae, native to Australia and New Guinea. It is classified as Least Concern by the IUCN, reflecting its relatively stable population across a broad range of freshwater and estuarine habitats on the Australian continent and associated islands. The species typically inhabits the banks of rivers, lakes, wetlands, and estuaries, where it constructs burrows in streambanks. It is highly adapted for an aquatic lifestyle, with partially webbed hind feet, a flattened head, and a dense waterproof coat. <em>Hydromys chrysogaster</em> is a carnivore, typically feeding on fish, crustaceans, mussels, frogs, and aquatic invertebrates, which it often carries to elevated feeding platforms to consume. The species is nocturnal and crepuscular, most active during early morning and evening hours near the water's edge. Biological traits including average lifespan, body length, and weight remain poorly documented in standardized databases, though adults are generally robust for a rodent, reportedly reaching body lengths of 20–35 cm excluding the tail. Geographic range details for this particular record remain incompletely documented in available data sources. Ecologically, the common water rat is an important apex predator in small-scale freshwater food webs and serves as an indicator species for wetland health in Australian riparian systems.

elk

Also known as the red deer, elk are among the largest members of the deer family, with antlered males reaching up to 240 kg. Found across temperate forests and grasslands of Europe, Asia, and North America, where populations were historically separated as distinct subspecies. Males shed and regrow their antlers annually, engaging in dramatic roaring contests during autumn rut. An important game and conservation species across its range.