test
node1
BFO:0000003
occurrent
node1->node1
node5
BFO:0000015
process
node1->node5
node2
GO:0007610
behavior
node3
GO:0071625
vocalization behavior
node2->node3
node4
GO:0032501
multicellular
organismal process
node4->node2
node6
GO:0008150
biological_process
node5->node6
node6->node4
node7
BFO:0000001
entity
node7->node1