This learning resource is available in interactive and printable formats. The interactive worksheet can be played online and assigned to students. The Printable PDF version can be downloaded and printed for completion by hand.
This interactive science reading passage, titled "Do Penguins Have Knees? The Hidden Truth!", answers a common and intriguing question about penguin anatomy. Aligned with NGSS Life Science standards, particularly MS-LS4-C (Adaptations), the passage reveals that penguins do indeed have knees, which are largely hidden within their bodies and covered by dense feathers and blubber. It explains how this unique leg structure is a crucial adaptation, providing a streamlined shape for efficient swimming and aiding in heat conservation in their cold marine environments. The text also connects this hidden anatomy to their distinctive waddling gait on land. This resource is excellent for fostering reading comprehension, expanding vocabulary related to animal anatomy and adaptations, and sparking curiosity about how different species are perfectly suited to their habitats.
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If you've ever watched a penguin waddle across the ice, you might have wondered: do they even have knees? Their short, stubby-looking legs certainly don't seem to bend in the middle like ours! This is a common question, and the answer might surprise you: Yes, penguins do have knees!
While you can't easily spot them from the outside, a penguin's legs are structured much like other birds, and even somewhat similar to human legs, with a femur (thigh bone), a knee joint (complete with a kneecap!), and lower leg bones (tibia and fibula). The reason we don't see their knees is a clever adaptation for their unique lifestyle.
Most of a penguin's upper leg bones, including the knee joint, are tucked up inside their body and covered by their dense feathers and blubber. This gives them a streamlined, torpedo-like shape that is incredibly efficient for "flying" through the water, where they spend most of their lives. Keeping their legs partly inside their bodies also helps them conserve body heat in their cold climate habitats.
When on land, penguins stand very upright, and their legs are positioned far back on their bodies. This posture, combined with their knees being permanently bent in a kind of squat, contributes to their characteristic
gait. While it might look a bit clumsy on land, this leg structure is perfectly designed for their true element: the water, where they are agile and powerful swimmers, using their webbed feet as rudders. So, the next time you see a penguin, remember, they've got knees, they're just well-hidden for a very good reason!
Do penguins have knees?
No, never.Yes, they do.Only baby penguins.Only males.
Where are a penguin's knees hidden?
In their flippers.Outside their body.Inside their body.Under their beak.
What covers a penguin's upper leg?
Scales.Bare skin.Dense feathers.Thin fur.
What shape does the hidden leg structure help create for swimming?
SquareRoundStreamlinedFlat
What posture do penguins have on land?
Crouched lowStanding uprightLying downRolling
What does their leg structure help them do in water?
FlyClimbSwim efficientlySleep
What is the main idea of this passage?
Penguins walk very fast.Penguins' hidden knees are an adaptation for their lifestyle.Penguins use their knees to fly.Penguins are the only birds with knees.
What other benefit does keeping legs tucked in provide in cold climates?