Bird Migration Flow

{
  "nodes": [
    { "id":"arc","type":"ellipse","label":"Arctic breeding","x":300,"y":40,"fill":"#dbeafe" },
    { "id":"bor","type":"rect","label":"Boreal forest","x":120,"y":160,"fill":"#dcfce7" },
    { "id":"gp", "type":"rect","label":"Great Plains","x":300,"y":160,"fill":"#dcfce7" },
    { "id":"app","type":"rect","label":"Appalachians","x":480,"y":160,"fill":"#dcfce7" },
    { "id":"glf","type":"rect","label":"Gulf coast","x":300,"y":280,"fill":"#fef3c7" },
    { "id":"cb", "type":"ellipse","label":"Caribbean","x":120,"y":400,"fill":"#fce7f3" },
    { "id":"ca", "type":"ellipse","label":"Central America","x":300,"y":400,"fill":"#fce7f3" },
    { "id":"sa", "type":"ellipse","label":"South America","x":480,"y":400,"fill":"#fce7f3" }
  ],
  "edges": [
    { "id":"e1","source":"arc","target":"bor" },
    { "id":"e2","source":"arc","target":"gp" },
    { "id":"e3","source":"arc","target":"app" },
    { "id":"e4","source":"bor","target":"glf" },
    { "id":"e5","source":"gp","target":"glf" },
    { "id":"e6","source":"app","target":"glf" },
    { "id":"e7","source":"glf","target":"cb" },
    { "id":"e8","source":"glf","target":"ca" },
    { "id":"e9","source":"ca","target":"sa" }
  ]
}