Misc: How precisely is the bird CYGNUS CYGNUS better known?

Questions

golden ---------- are so rare that a biological reserve has been specifically created for them?

---------- often sleep for up to fourteen hours a day?

gorillas often sleep for up to ---------- hours a day?

hippopotamuses do ---------- percent of their vocalization under water?

if a frog's mouth is held open for too long the frog will----------?