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How Animals Use Smell and Touch — Reading Comprehension

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NGSS 4-LS1-2
LS1.D

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This engaging 250-word reading passage introduces fourth-grade students to how animals use smell and touch as critical senses for survival. Aligned with NGSS standard 4-LS1-2 and the Disciplinary Core Ideas for LS1.D, the passage explains how different animals have developed specialized sensory organs. Students learn that dogs possess noses hundreds of times more sensitive than humans, enabling them to identify other animals, locate food, and detect danger. The passage describes how whiskers on cats and mice detect vibrations to help these animals navigate in complete darkness. Students discover that snakes use their tongues to smell their environment, and star-nosed moles have touch-sensitive tentacles on their noses to find food underground. Written at an appropriate fourth-grade reading level, this audio-integrated passage uses simple vocabulary and real-world examples to build foundational understanding of animal sensory structures and their functions. The passage includes bolded key terms with immediate definitions, helping students develop science vocabulary. Accompanying activities include comprehension questions, writing prompts, and graphic organizers that reinforce learning objectives while encouraging critical thinking about how different animals have adapted their senses to meet survival needs in various environments.

CONTENT PREVIEW

Diagram of a puppy using sensitive nose and whiskers to find a bone. — This diagram shows how dogs find buried treasures with scent and whiskers.

Animals use their senses to gather important information about the world around them. Two senses that help many animals survive are smell and touch. Smell is the ability to detect chemicals in the air or water, while touch is the ability to feel objects and vibrations. These senses help animals find food, avoid danger, and move through their environment.

Dogs have an amazing sense of smell. A dog's nose is hundreds of times more sensitive than a human nose, which means it can detect very small amounts of scent. Dogs use smell to identify other animals, find food that is hidden or buried, and even detect danger like smoke or strangers approaching. Police dogs and search dogs use their powerful noses to help find missing people or detect harmful substances.

Many animals use touch to explore their world. Cats and mice have special hairs called whiskers that grow on their faces. Whiskers are very sensitive and can detect tiny vibrations in the air. This helps these animals navigate in the dark when they cannot see well. The whiskers tell them if a space is too narrow to fit through or if something is moving nearby.

Some animals have unusual ways to smell and touch. Snakes smell with their tongues! They flick their tongues out to collect chemical particles from the air, then bring them inside to a special sensory organ in their mouth. Star-nosed moles live underground where it is completely dark. They have 22 small, finger-like tentacles on their nose that are extremely sensitive to touch. These tentacles help the mole quickly find worms and insects to eat in the soil.

Interesting Fact: A bloodhound's sense of smell is so powerful that it can follow a scent trail that is over 12 days old! These dogs have about 300 million scent receptors in their noses, compared to only 5 million in humans.

How sensitive is a dog's nose?

Ten times more than humansHundreds of times more than humansThe same as humansSlightly better than humans

What do whiskers help animals detect?

Temperature changesLight and colorsVibrations in the airSounds from far away

How many tentacles does a star-nosed mole have?

10 tentacles15 tentacles22 tentacles30 tentacles

Why do dogs use their sense of smell?

Only to find foodTo identify animals and detect dangerOnly to play gamesTo communicate with other dogs

How do whiskers help cats in darkness?

They light up the areaThey make sounds to find objectsThey detect vibrations to navigateThey change color in the dark

Why do star-nosed moles need sensitive tentacles?

To swim in waterTo find food in dark underground soilTo climb treesTo fly through caves