Cat adaptations lesson plan: structures and senses

Lesson plan

• Objectives: students (1) name four cat structures and the job each does, (2) explain how each helps a cat survive, and (3) draw a sense, brain, response chain for a real cat behavior.
• Materials: printed worksheet, a ruler, string or yarn, scissors, a cardboard box with a few holes of different widths cut in one side (optional demo).
• Vocabulary: adaptation, structure, function, sense, carnivore, vibrissae (see the vocabulary list).

1. Hook (5 minutes). Ask: "How can a cat tell if it will fit through a gap without trying?" Collect guesses.
2. Mini lesson (15 minutes). Teach the four structure cards below. For each one, ask "How does this help a cat survive?"
3. Whisker gap demo (10 minutes). Cut a piece of string as wide as a student's shoulders. The student holds it in front of their face and tests which holes in the box it could pass through without bending. Explain that a cat's whiskers are about as wide as its body and work like this measuring string.
4. Model it (15 minutes). Students complete the sense, brain, response worksheet.
5. Share and argue (10 minutes). Each student writes one sentence: "A cat's ___ helps it survive because ___."

Four structure cards

1. Whiskers (external structure, touch)

Whiskers, or vibrissae, are thick hairs with sensors at the base that feel touch and air movement and send messages to the brain. Most cats have 24 whiskers on their cheeks. They help a cat feel objects close to its face, move around in the dark and judge whether a gap is wide enough to fit through.

2. Ears (external structure, hearing)

Cats have one of the broadest hearing ranges of any mammal. In a laboratory hearing test of two cats, sounds played at a fairly loud level were heard from 48 hertz (a very low hum) up to 85,000 hertz (a squeak far too high for people to hear). Hearing high, quiet sounds helps a predator find small prey. When cats hear a voice that matters to them, they move their ears and turn their heads toward it.

3. Eyes (external structure, sight)

Cats see about six times better than people in dim light, which helps them hunt at dawn and dusk. But they have trouble focusing on things very close to their face, so their whiskers take over at close range. Genetic studies have found signs of natural selection in cat genes linked to vision and hearing.

4. Tongue and taste buds (internal and external structures, taste)

Cats are carnivores: they must eat food made from animals, and they need nutrients such as taurine that come from meat. Without enough taurine a cat's heart muscle can fail, which is why cat foods have it added. Cats also cannot taste sugar, because one of the genes needed for a sweet taste receptor does not work in cats. A meat eater does not need to find sweet fruit.

Worksheet: sense, brain, response

Name:

For each situation, write which sense the cat uses, what its brain figures out, and how the cat responds.

Argue it: Choose one structure. Finish the sentence: "A cat's ____________ helps it survive because ____________."

Differentiate

• Grade 3 support: give students the sense column filled in and ask only for the response.
• Grade 5 challenge: compare the cat's sweet taste gene with a dog or human, and discuss why losing a sense might not harm a carnivore.
• Safety and kindness: remind students never to trim or pull a cat's whiskers and to let cats approach on their own terms (see cat body language).