Jörmungandr , alternately referred to as the Midgard Serpent or World Serpent , is a sea serpent of the Norse mythology , the middle child of Loki and the giantess Angrboða .
Head entity: world serpent Q181227 10 11
Tail entity: angrboða Q371828 30
Relation (head \u2192 tail): P25
Inverse relation (tail \u2192 head): P40