Penguins are flightless but fast swimmers.

Penguins are flightless but fast swimmers.

• A. They Fly Well Underwater
• B. Flightless Birds That Are Fast and Graceful Swimmers
• C. They Cannot Swim
• D. They Migrate Across Continents

Answer: (B)

Flightless birds can still be incredible movers in another environment. Penguins are built for water: their wings have evolved into strong flippers, their bodies are compact and streamlined, and powerful strokes plus a streamlined shape let them chase prey and glide through the ocean very quickly. That combination fits perfectly with describing them as flightless birds that are fast and graceful swimmers. The option that says they fly well underwater isn’t accurate because flying is an aerial ability, and penguins don’t fly; they swim with their flippers. Saying they cannot swim is false, since their entire lifestyle centers on efficient underwater propulsion. Finally, migrating across continents isn’t a defining trait here—penguins move primarily through the water rather than traversing continents on land, so that statement doesn’t capture what makes penguins notable.

Flightless birds can still be incredible movers in another environment. Penguins are built for water: their wings have evolved into strong flippers, their bodies are compact and streamlined, and powerful strokes plus a streamlined shape let them chase prey and glide through the ocean very quickly. That combination fits perfectly with describing them as flightless birds that are fast and graceful swimmers.

The option that says they fly well underwater isn’t accurate because flying is an aerial ability, and penguins don’t fly; they swim with their flippers. Saying they cannot swim is false, since their entire lifestyle centers on efficient underwater propulsion. Finally, migrating across continents isn’t a defining trait here—penguins move primarily through the water rather than traversing continents on land, so that statement doesn’t capture what makes penguins notable.