We doubt that Lily is a swan. It is probable that Greg is a swan. We doubt that Bernhard is a lion.
There is a better than even chance that either Greg is a swan, or Lily is a swan.
There is a better than even chance that either Greg is a swan, or Lily is a swan.
There is little chance that either Greg is a swan, or Lily is a swan.
Either Greg is a swan, or Lily is a swan.