"Mother Carey's chicken" meaning in English

{
  "forms": [
    {
      "form": "Mother Carey's chickens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {
        "head": "Mother Carey's chicken"
      },
      "expansion": "Mother Carey's chicken (plural Mother Carey's chickens)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "topical",
          "langcode": "en",
          "name": "Nautical",
          "orig": "en:Nautical",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Tubenose birds",
          "orig": "en:Tubenose birds",
          "parents": [
            "Seabirds",
            "Birds",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1773, James Cook, The Journals, Second Voyage, 27 December",
          "text": "A few blue petrels, black sheer-waters and Mather Caries chickens are all the birds we see."
        },
        {
          "ref": "2004, Nicholas Shakespeare, In Tasmania, Harvill Press, p. 36",
          "text": "Kemp watched sperm whales and green turtles and hundreds of gulls and petrels – known as “Mother Carey's chickens” – that flew around the ship with piercing screams."
        }
      ],
      "glosses": [
        "The storm petrel."
      ],
      "id": "en-Mother_Carey's_chicken-en-noun-PdSsgn3o",
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "storm petrel",
          "storm petrel"
        ]
      ],
      "raw_glosses": [
        "(originally nautical) The storm petrel."
      ]
    }
  ],
  "word": "Mother Carey's chicken"
}

{
  "forms": [
    {
      "form": "Mother Carey's chickens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "Mother Carey's chicken"
      },
      "expansion": "Mother Carey's chicken (plural Mother Carey's chickens)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
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        "en:Nautical",
        "en:Tubenose birds"
      ],
      "examples": [
        {
          "ref": "1773, James Cook, The Journals, Second Voyage, 27 December",
          "text": "A few blue petrels, black sheer-waters and Mather Caries chickens are all the birds we see."
        },
        {
          "ref": "2004, Nicholas Shakespeare, In Tasmania, Harvill Press, p. 36",
          "text": "Kemp watched sperm whales and green turtles and hundreds of gulls and petrels – known as “Mother Carey's chickens” – that flew around the ship with piercing screams."
        }
      ],
      "glosses": [
        "The storm petrel."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
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          "storm petrel",
          "storm petrel"
        ]
      ],
      "raw_glosses": [
        "(originally nautical) The storm petrel."
      ]
    }
  ],
  "word": "Mother Carey's chicken"
}