Freshwater Animals Quiz

Question 1

Which large South American river mammal uses echolocation to navigate murky river water?

Accepted Answer

Amazon river dolphin (boto)

Answer

Amazon manatee

Answer

Capybara

Answer

Giant otter

Question 2

The beaver is famous for building dams. Why do beavers build dams?

Accepted Answer

To create a deep pond around their lodge for protection from predators and to store food underwater

Answer

To create a food storage area for winter

Answer

To mark their territory against rival beavers

Answer

To collect fish more easily

Question 3

Which fish is famous for swimming thousands of kilometres upriver to spawn in exactly the same place where it was born?

Accepted Answer

Salmon

Answer

Trout

Answer

Pike

Answer

Catfish

Question 4

The electric eel lives in South American rivers. Despite its name, what kind of fish is it?

Accepted Answer

It is a knifefish, more closely related to catfish than true eels

Answer

It is a true eel (order Anguilliformes)

Answer

It is an electric ray that lives in freshwater

Answer

It is a type of lamprey

Question 5

Which large freshwater reptile found in Africa and Asia ambushes prey from the water's edge?

Accepted Answer

Nile crocodile

Answer

Alligator

Answer

Monitor lizard

Answer

Anaconda

Question 6

The hippopotamus is the third-largest land animal. How much of its day does it spend in water?

Accepted Answer

About 75-80% of the day

Answer

About 25% of the day

Answer

About 50% of the day

Answer

Almost 100% — hippos almost never leave water

Question 7

Which colourful freshwater bird dives into rivers to catch fish and is known for its vivid plumage?

Accepted Answer

Kingfisher

Answer

Heron

Answer

Cormorant

Answer

Dipper

Question 8

The water otter is famous for a charming behaviour. What do otters use their chests for while floating?

Accepted Answer

As a table to balance food, and mother otters wrap their pups in kelp while they dive

Answer

To regulate body temperature by exposing their lighter belly

Answer

To store fish caught during diving

Answer

To communicate by thumping their chest on the water surface

Question 9

Which South American freshwater fish hunts in large schools and is famous (perhaps unfairly) for its aggressive feeding behaviour?

Accepted Answer

Piranha

Answer

Pacu

Answer

Arapaima

Answer

Peacock bass

Question 10

What is the largest freshwater fish in the world?

Accepted Answer

Mekong giant catfish or Beluga sturgeon (both disputed)

Answer

Wels catfish

Answer

Arapaima

Answer

Nile perch

Question 11

The water vole is a small rodent that lives along British rivers. What made it nearly extinct in the UK?

Accepted Answer

The introduction of American mink — a non-native predator that hunts water voles along riverbanks

Answer

Pollution from agriculture

Answer

Flooding due to climate change

Answer

Habitat loss from river management

Question 12

Which unusual freshwater mammal from Australia can sense prey using electrical receptors in its bill?

Accepted Answer

Platypus

Answer

Quokka

Answer

Water rat (Rakali)

Answer

Echidna

Question 13

The great crested newt is a freshwater amphibian protected by law in the UK. Why does the male grow a jagged crest?

Accepted Answer

As a sexual display to attract females during the spring breeding season

Answer

For hydrodynamic efficiency when swimming fast

Answer

To regulate body temperature like a sail

Answer

As a defence against predators — the crest is toxic

Question 14

Giant river otters in the Amazon can reach 1.8 metres long. How do they hunt?

Accepted Answer

In coordinated family groups, herding fish cooperatively

Answer

Alone, silently stalking fish from riverbanks

Answer

By diving and holding their breath for up to 8 minutes

Answer

Using tools to dislodge fish from hiding places

Question 15

Which African freshwater giant, related to pigs and whales, is considered the most dangerous large mammal in Africa?

Accepted Answer

Hippopotamus

Answer

Nile crocodile

Answer

African buffalo

Answer

Elephant

Question 16

The freshwater pearl mussel is one of Britain's rarest animals, requiring extremely clean water. How long can it live?

Accepted Answer

Up to 130 years

Answer

Up to 15 years

Answer

Up to 30 years

Answer

Up to 300 years

Question 17

The dipper is a remarkable small bird found along fast-flowing streams. What makes it unique among songbirds?

Accepted Answer

It is the only songbird that regularly walks underwater along stream beds to find food

Answer

It is the only songbird that can sing underwater

Answer

It is the only British songbird that migrates to Africa

Answer

It is the only songbird that builds its nest underwater

Question 18

Lake Baikal in Russia is remarkable for its freshwater wildlife. What percentage of its species are found nowhere else on Earth?

Accepted Answer

About 80%

Answer

About 20%

Answer

About 40%

Answer

About 60%

Question 19

Which South American freshwater turtle can stay completely submerged for months during dry season?

Accepted Answer

South American river turtle (arrau)

Answer

Red-eared slider

Answer

Matamata turtle

Answer

Yellow-spotted river turtle

Question 20

Why do dragonfly nymphs live underwater for months or years before becoming adult dragonflies?

Accepted Answer

The aquatic larval stage is their main feeding and growth phase — they are voracious underwater predators before emerging

Answer

They need clean water to develop their wings properly

Answer

Water protects their developing wings from drying out

Answer

They need to learn to breathe before they can survive in air