The platypus

(archaic) A bill of health that states that there is infectious disease present in either a ship, or its port of departure.

A bill of health that states that there is no infectious disease present in a ship, or its port of departure. / (figuratively, by extension) A statement that indicates that there are no obvious problems.

a bird from the family Rallidae, Neocrex erythrops.

Gavia adamsii, the largest member of the loon or diver family, having a black head, white underparts and checkered black-and-white mantle.

A duck, Gavia adamsii, found in the arctic and subarctic.

(idiomatic, US politics) A bill consisting of many riders that attracts many, often unrelated, floor amendments, which may provide special benefits to various groups or interests.

Clytoctantes alixii, a species of antbirds.

A tinamou, Nothoprocta curvirostris.

A tinamou, Crypturellus parvirostris.