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@startuml

skin rose

title Bird database

class Species {
  SpeciesID
  Name
}

class Regions {
  RegionID
  Name
}

class Sightings {
  SightingID
  Latitude
  Longitude
  Date
}

class Spotters {
  SpotterID
  Name
}

Regions -right- Species: "0..*        0..*"
Species -right- Sightings: "1        0..*"
Sightings -right- Spotters: "0..*        0..1"

@enduml