Freshwater is a vital and scarce resource on our planet with only 3% of the water on Earth being freshwater rivers and lakes, the rest being oceans. Freshwater rivers and lakes are formed when hollows are made in the Earth, such as when land collapses after a magma flow allowing for rainwater or melted snow to flow through and accumulate in the empty space. However, even though freshwater biomes are not expansive, they are still home to over 100,000 different species of plants and animals. Many amphibian species, such as turtles, frogs, and alligators, live in freshwater biomes. Mammals, such as otters and beavers, live in freshwater biomes too, with many more mammals stopping by a river or lake for a drink.

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Freshwater Animals

Hippopotamus
114.0"-168.0" (9’6"-14’) | 2.9-4.3 m
3D
Saltwater Crocodile
14’-23’ | 4.25-7 m (Male); 7.5’-11’ | 2.30-3.35 m (Female)
3D
Saltwater Crocodile
880-2200 lb | 400-1000 kg (Male); 180-220 lb | 82-100 kg (Female)
3D

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Saltwater Crocodile
Dimensioned size comparison illustration of a Saltwater Crocodile compared to an average person

The Saltwater Crocodile, also known as the estuarine crocodile, Indo-Pacific crocodile, marine crocodile, sea crocodile, and saltie, is one of the largest living crocodiles. It is native to saltwater habitats and brackish wetlands including India’s east coast across Southeast Asia and the Sundaic region to northern Australia and Micronesia. The saltwater crocodile was hunted for its skin up until the 1970s, and today it is listed as least concern on the IUCN Red List. The species are hypercarnivorous apex predators, and they can overtake almost any animal that enters their territory. Saltwater crocodiles range in color with some retaining pale skin, while others may be so dark to appear black.

The typical male Saltwater Crocodile has an overall length of 14’-23’ (4.25-7 m), with females at lengths of 7.5’-11’ (2.30-3.35 m). An average male Saltwater Crocodile weighs between 880-2200 lb (400-1000 kg) and has a typical lifespan of 70-100 years in the wild.

Aerial plan view drawing of a Saltwater Crocodile walking
The Saltwater Crocodile is one of the largest living crocodiles. Saltwater Crocodiles are native to saltwater habitats and are hypercarnivorous apex predators, that can overtake almost any animal that enters their territory. Saltwater crocodiles range in color from pale to dark skin.

The typical male Saltwater Crocodile has an overall length of 14’-23’ (4.25-7 m), with females at lengths of 7.5’-11’ (2.30-3.35 m). An average male Saltwater Crocodile weighs between 880-2200 lb (400-1000 kg) and has a typical lifespan of 70-100 years in the wild.

Aerial plan view drawing of a Saltwater Crocodile walking
Saltwater Crocodile
Height:
Width:
Length:
14’-23’ | 4.25-7 m (Male); 7.5’-11’ | 2.30-3.35 m (Female)
Depth:
Weight:
880-2200 lb | 400-1000 kg (Male); 180-220 lb | 82-100 kg (Female)
Area:
Speed
15-18 mph | 24-29 km/h
Scientific Name
Crocodylus porosus
Lifespan
70-100 (wild); 100-120 (captivity)

Drawings include:
Saltwater Crocodile side elevation, side (person), plan

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Hippopotamus
Drawing comparing the scale of a hippopotamus to a human with dimensions for height and length

Hippopotamuses, or hippos for short, are large semiaquatic mammals found in sub-Saharan Africa. Commonly sighted in rivers, swamps and lakes, the hippopotamus is an herbivore that lives mostly in the water when not feeding on nearby grasses. The hippo is the third-largest land mammal on the planet.

The typical Hippopotamus has an overall height of 54.0"-78.0" (1.4-2 m) and body length of 114.0"-168.0" (9’6"-14’) (2.9-4.3 m). An average Hippopotamus weighs between 3,100-8,800 lb (1,500-4,000 kg) and has a typical lifespan of 40-50 years.

Illustrations of a Hippopotamus from the side, front, back, and laying down
Hippopotamuses, or hippos for short, are large semiaquatic mammals found in sub-Saharan Africa. Commonly sighted in rivers, swamps and lakes, the hippopotamus is an herbivore that lives mostly in the water when not feeding on nearby grasses. The hippo is the third-largest land mammal on the planet.

The typical Hippopotamus has an overall height of 54.0"-78.0" (1.4-2 m) and body length of 114.0"-168.0" (9’6"-14’) (2.9-4.3 m). An average Hippopotamus weighs between 3,100-8,800 lb (1,500-4,000 kg) and has a typical lifespan of 40-50 years.

Illustrations of a Hippopotamus from the side, front, back, and laying down
Hippopotamus
Height:
54.0"-78.0" (4’6"-6'6") | 1.4-2 m
Width:
Length:
114.0"-168.0" (9’6"-14’) | 2.9-4.3 m
Depth:
Weight:
3,100-8,800 lb | 1,500-4,000 kg
Area:
Scientific Name
Hippopotamus amphibius
Lifespan
40-50 years

Drawings include:
Hippopotamus side profile, front, back, side (laying down)

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