The cassowary is one of the ratites, a particular group of Flightless Birds. Other members of this group, and therefore birds related to the cassowary, are the emu, kiwi,ostrich and rhea.
The cassowary's closest relative is the emu. Cassowaries and emus both live in Australia and although they are classed as birds, they are among the very few birds that can't actually fly at all. They are members of a group of birds called ratites. Other ratites include the kiwi from New Zealand, the ostrich from Africa and the rhea from South America. Ratites have wings but the bones in their chests do not have the capacity for flight muscles, which is what a bird needs to fly.
Emu
Bears are from the family ursidae, while dogs are from canidae, making their closest relative the dingo.
Homo erectus is the closest known relative to modern humans.
The closest relative to the wombat is the koala.
The closest relative's to the llama is alpaca's,and camel's
The Bengal tiger is the tiger that is the closest living relative of the Amur tiger.
I would have to say the closest relative to the seahorse is the koala, since that is the category in which this question is located.
The great auk (extinct) Puffins Storks may be the closest relative from DNA analysis.
lynxes or closest relative for bobcats
The giraffe's closest relative is the okapi.
Yes, your husband is considered to be your closest relative.
Wolf
The chimpanzee