Question

Animals living in the open sea are
A. Nekton
B. Benthos
C. Plankton
D. Pelagic

Answer 1

Hint: These are the seabirds that live on open seas and oceans rather than inland or around more restricted waters such as lakes and rivers.

Complete answer:
Pelagic animals live in the pelagic zone of ocean or lake water. The Pelagic word is derived from ancient Greek Pelagos, meaning 'open sea'. Pelagic fish range in size from small coastal forage fish to large apex predators’ oceanic fishes. The pelagic zone is neither near the bottom nor near the landmass, they can spend most of their lives in the air for many days or weeks which is one of the unique features of Pelagic birds, Examples – Sardines, forage fish, and herrings.
So, the right option to this question is option ‘D’ (Pelagic).
Additional information: -
Pelagic birds have incredibly long, thin wings that allow them to fly easily without resting for long periods. The albatross of up to \[8 - 12\]feet has the longest wingspan of any bird in the world. Some of the pelagic birds can stay aloft, and can even sleep-in flight at a time for days or weeks, they can spend most of their lives in the air. They often prefer rocky, cliff-lined coasts and offshore islands when they come back to land, where strong air currents can help them take flight again. Although seabirds face many dangers, pelagic birds can be exceptionally long-lived if they can escape those hazards. The oldest known living bird is a Laysan albatross named wisdom, who has banded a long time ago in \[1956\] and the bird lived at least \[65\] years of age, successfully.

Note: Pelagic birds have a special salt gland in their head, which acts as a filter for the extremely saline seawater due to the presence of these glands they drink seawater and ingest water from their oceanic prey without accumulating the toxic levels of salt in their bloodstreams. After filtering, the saltwater is ejected or removed through beaks or special nostrils above the beak in some of the birds.