Fulmarus glacialis and Petrel

Fulmarus glacialis noun - Heavy short-tailed oceanic bird of polar regions.

Petrel and Fulmarus glacialis are semantically related. In some cases you can use "Petrel" instead a noun phrase "Fulmarus glacialis".

Petrel noun - Relatively small long-winged tube-nosed bird that flies far from land.

Fulmarus glacialis and petrel are semantically related. Sometimes you can replace phrase "Fulmarus glacialis" with "Petrel", this terms are similar.