Week 2 · Axis 1, Unit 1 Living Systems, Concept 1.1 Adaptation and Survival (B) · 3 lessons
1
Body and behaviour adaptations
Discovery Education Science P4: Term 1, Unit 1, pp. 10–18
GoalTell a structural adaptation from a behavioural one and say what adaptations are for.
New words
structural adaptation · a part of the body that helps survival, such as fur or a beakbehavioural adaptation · something an animal does that helps it survivereproduce · to have young of the same kind
Explanation
An adaptation helps a living thing survive and reproduce, which means to have young. There are two main kinds. A structural adaptation is a part of the body: thick fur, a strong beak, long legs, big ears. A behavioural adaptation is something the animal does: hiding in a burrow at noon, hunting at night, or flying to warmer lands for the winter. Each year white storks fly over Egypt on their way south, and that is a behavioural adaptation. Adaptations are not wishes or choices. A lizard cannot grow thicker skin because it wants to. Over many generations, animals with features that suit their habitat survive better and have more young, so those features become common in the species. One animal does not adapt in its own lifetime.
Adaptation
Kind
thick fur
structural
strong beak
structural
hiding in a burrow at noon
behavioural
flying south for the winter
behavioural
Worked examples
A giraffe’s long neck lets it eat leaves at the top of a tree. The neck is part of its body, so it is a structural adaptation.
At noon a desert lizard goes under a rock and comes out when the sand is cooler. Going under a rock is something it does, so it is a behavioural adaptation.
Every autumn a stork leaves the cold north and flies over Egypt toward warmer lands. Marwan sees the flocks from his roof. Flying away for the winter is behaviour.
Class activity
Adaptation sort. Copy these onto eight small paper cards: webbed feet, digging a burrow, sharp claws, hunting at night, a long tail for balance, hiding food for winter, spines, a loud call to scare enemies. Make two piles: Structural and Behavioural. Check with a friend. (Structural: webbed feet, sharp claws, long tail, spines. Behavioural: the other four.)
Practice
1
Is a woodpecker’s strong beak structural or behavioural?
Structural. It is a body part.
2
A squirrel hides nuts in the ground for winter. Structural or behavioural?
Behavioural. It is something the squirrel does.
3
Which picture shows a structural adaptation? Say the letter.
A: the camel’s long legs and body are body parts. B is a behaviour, sleeping.
4
Why can we not say “a cat grew a thick coat because it wanted to”?
Adaptations build up over many generations; one animal cannot choose them.