Belly Up--or Down?

At the Kushiro tancho reserve in eastern Hokkaido, Mr. Takahashi, dedicated caretaker, explains that as a rule, the cranes mate for life. If one crane of a mated pair dies, the survivor will protect the corpse for a long period. If the corpse is belly side up, the survivor will "remarry" as if it recognizes the death, but if the corpse is belly side down, the survivor will not remarry. (worldhop.com