Which are the animals that live in freshwater?

It's impossible to list *every* animal that lives in freshwater, as it's a vast and diverse group! But here's a breakdown of some common types and examples:

Fish:

* Popular examples: Trout, salmon, catfish, bass, carp, goldfish (though these are often domesticated)

* Diverse types: From tiny minnows to enormous sturgeon, there's a huge variety

Amphibians:

* Popular examples: Frogs, toads, salamanders, newts

* Lifecycles: Many spend part of their life in water (tadpoles) and part on land

Reptiles:

* Examples: Alligators, crocodiles (some species), turtles, snakes (e.g., water snakes)

* Adaptations: Some have webbed feet, others can hold their breath for long periods

Invertebrates:

* Huge diversity: Insects (dragonflies, water beetles), crustaceans (crayfish, shrimp), molluscs (snails, mussels), worms (earthworms, leeches)

* Important roles: They form the base of the food chain and break down organic matter

Mammals:

* Examples: Beavers, otters, muskrats, water shrews, dolphins (river dolphins)

* Adaptations: Webbed feet, waterproof fur, adaptations for swimming

Other:

* Plankton: Microscopic organisms (algae, bacteria, zooplankton) that form the base of the freshwater food web

* Birds: Waterfowl (ducks, geese, swans), wading birds (herons, egrets)

Important Note: The specific animals found in freshwater habitats vary depending on:

* Location: Tropical freshwater is different from Arctic freshwater

* Water type: Lakes, rivers, ponds, swamps all have different conditions

* Depth and temperature: These influence which species can survive

Let me know if you'd like to learn more about specific animals or freshwater habitats!