Interactive worksheet for learning about animal classification and mammal traits.

Let’s go step by step to fill in the blanks using the word bank.

We are looking at the “Mammals” section of the diagram. The word bank gives us these words:

Vertebrates, invertebrates, viviparous, oviparous, lungs, gills, carnivores, herbivores, omnivores, eggs, scales, feathers, legs, wings, milk

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Step 1: “They have four ______ or limbs”

Looking at the dog picture — it has four legs. Also, most mammals have four legs (except dolphins, manatees, whales — which are noted as exceptions). So this blank is legs.

→ *They have four legs or limbs*

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Step 2: “They breathe with ______”

The picture shows lungs next to this box. Mammals breathe air using lungs. Fish use gills, but not mammals.

→ *They breathe with lungs*

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Step 3: “Mothers nurse their young with ______”

All mammal mothers produce milk to feed their babies. That’s a key trait of mammals.

→ *Mothers nurse their young with milk*

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Step 4: “Babies grow inside their mother’s womb.” → This describes how they give birth.

Most mammals give birth to live young (not from eggs). The word for that is viviparous.

But note: there’s an exception box saying “Except: Platypus and Equidna” — those are egg-laying mammals (oviparous). So the general rule is viviparous.

→ *They are viviparous*

Wait — let’s check the other arrow pointing to the elephant skeleton. It says “They are ____________” and points to the same group. Since elephants are mammals and give live birth, again — viviparous.

Actually, looking again: one arrow goes from “Mammals” to “They are ________” (with elephant), and another goes to “They are ________” (with horse showing baby inside womb). Both should be viviparous, since both describe giving live birth.

But wait — maybe one is about being vertebrates? Let’s think.

Elephant skeleton shown — that means they have backbones → so they are vertebrates.

Yes! That makes sense. All mammals are vertebrates. The skeleton image hints at that.

So:

→ Arrow to elephant: “They are vertebrates”
→ Arrow to horse (baby in womb): “They are viviparous”

That fits better.

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Step 5: Nutrition section

“They can be…”

Three types based on diet:

- Eat other animals → carnivores
- Eat plants → herbivores
- Eat plants and animals → omnivores

These match the definitions given in parentheses.

→
- carnivores (They eat other animals)
- herbivores (They eat plants)
- omnivores (They eat plants and animals)

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Now let’s put all answers together in order as they appear in the diagram:

Starting from top left going clockwise around “Mammals”:

1. They have four legs or limbs
2. They breathe with lungs
3. Mothers nurse their young with milk
4. Babies grow inside their mother’s womb → They are viviparous (horse image)
5. Elephant image → They are vertebrates
6. Nutrition:
- carnivores
- herbivores
- omnivores

Also, note: the “Except: Dolphin, Manatee, Whale...” under “four legs” — that’s just noting exceptions, no blank to fill there.

And “Except: Platypus and Equidna” under viviparous — also just noting exceptions.

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Final check: Did we use only words from the word bank? Yes.

Did we miss any blanks? Let’s count:

Blanks in diagram:

- Four ___ → legs ✔
- Breathe with ___ → lungs ✔
- Nurse with ___ → milk ✔
- They are ___ (elephant) → vertebrates ✔
- They are ___ (horse/womb) → viviparous ✔
- Nutrition: three blanks → carnivores, herbivores, omnivores ✔

Total 8 blanks filled.

Perfect.

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Final Answer:
legs
lungs
milk
vertebrates
viviparous
carnivores
herbivores
omnivores