That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

This animal is a protected species, so you must never touch it.

Protectionist policies are adopted to protect domestic industries from foreign competition.

The beluga whale lives in the Arctic Ocean.

The consent of the guardian is necessary.

The harbour porpoise is a small dolphin that lives in the cold sea areas of the Northern Hemisphere.

Delphinus is one of the most beautiful constellations in the night sky.

The Amazon River dolphin is known for its distinctive pink color.