UNIT 2:
Basic Types of Animals and their Characteristics
Amphibians
- All amphibians are vertebrates, and they need moist environments or water to survive.
- They are cold-blooded.
- They absorb water and breathe through their thin skin.
- They have at least one special skin gland used for defense.
- Most follow the life cycle of egg-larva-adult.
Examples of Amphibians: frogs, newts, salamanders, toads etc.
- Birds are a type of warm-blooded vertebrate that are adapted to fly.
- Not all birds can fly, but they do all have wings.
- Birds have beaks that help them catch and swallow food.
- Birds lay eggs to reproduce.
- They are endothermic, meaning they maintain their own constant body temperature.
- They are bipedal, which means they have two legs.
- They have hollow bones and their bodies are covered in feathers.
- Birds belong to the class called Aves.
Examples of Birds: chickens, hummingbirds, falcons, flamingoes, ostriches, owls, parrots, penguins, pigeons
Fish
- Fish are also vertebrates, and they are considered the oldest-known vertebrates.
- They are ectothermic, or cold-blooded, which means they rely on their surroundings to regulate their body temperature.
- Fish have fins.
- Most, but not all, fish have bodies covered in scales and breathe through gills.
- Fish live underwater.
Examples of Fish: Eels, hagfish, lampreys, minnows, rays, salmon, seahorses, sharks
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