25

It seems we all understand what is meant by "seabirds". However, there exists no single ………………… of seabirds.

DEFINE

26

Two seabird specialists put it this way: "The one common characteristic that all seabirds share is that they feed in saltwater; but, as seems to be true with any ………………… in biology, some do not."

STATE

27

Do you know that penguins are considered to be birds though they cannot fly? That's why they are often referred to as "flightless birds". Penguins are the best ………………… in the bird world. They spend most of their lives in water, where they catch fish and tiny animals called krill.

SWIM

28

King penguins and emperor penguins ………………… dive deeper than 250 metres. Emperor penguins have been timed making dives lasting more than 18 minutes.

REGULAR

29

Another seabird, called the gannet, makes a ………………… dive from a height of 30 metres above the sea to catch fish in the sea. It enters the water, seizes its prey and surfaces a few seconds later.

FANTASY