Misc: What country's anthem begins 'O God Bestower of the blessings of the Swazi'?

Questions

The basenji is a mid-sized dog with a silky copper coat. Although they are considered a barkless dog, they are known to ---------- when they are happy.?

Octopi and squid have ---------- hearts. Their main systemic heart pumps blood throughout the circulatory system, and two branchial hearts provide some additional push at each of the paired gills.?

Hens do not have to be impregnated to lay eggs. The ---------- is necessary only to fertilize the egg.?

Cats are the only domestic animals that walk directly on their ----------, not on their paws. This method of walking is called "digitigrade". When cats scratch furniture, it isn't an act of malice. They are actually tearing off the ragged edges of the sheaths of their talons to expose the new sharp ones beneath.?

The hummingbird is the only bird that can ----------?