Egg-laying mammal and Ornithorhynchus anatinus

Egg-laying mammal noun - The most primitive mammals comprising the only extant members of the subclass Prototheria.

Ornithorhynchus anatinus and egg-laying mammal are semantically related. In some cases you can replace phrase "Ornithorhynchus anatinus" with "Egg-laying mammal", this phrases are similar.

Ornithorhynchus anatinus noun - Small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae.

Egg-laying mammal and Ornithorhynchus anatinus are semantically related. You can use "Egg-laying mammal" instead a noun phrase "Ornithorhynchus anatinus".