"fen nightingale" meaning in English

{
  "etymology_text": "From their continued croaking at night.",
  "forms": [
    {
      "form": "fen nightingales",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fen nightingale (plural fen nightingales)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Anurans",
          "orig": "en:Anurans",
          "parents": [
            "Amphibians",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1934, Neil Bell, Bredon and Sons, page 15",
          "text": "Tom Spence is a dom fule and doesn't know a fen nightingale from a natterjack.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A frog or toad."
      ],
      "id": "en-fen_nightingale-en-noun-qlk3wl~P",
      "links": [
        [
          "frog",
          "frog"
        ],
        [
          "toad",
          "toad"
        ]
      ],
      "raw_glosses": [
        "(UK, slang, archaic) A frog or toad."
      ],
      "tags": [
        "UK",
        "archaic",
        "slang"
      ]
    }
  ],
  "word": "fen nightingale"
}

{
  "etymology_text": "From their continued croaking at night.",
  "forms": [
    {
      "form": "fen nightingales",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fen nightingale (plural fen nightingales)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms with archaic senses",
        "English terms with quotations",
        "Quotation templates to be cleaned",
        "en:Anurans"
      ],
      "examples": [
        {
          "ref": "1934, Neil Bell, Bredon and Sons, page 15",
          "text": "Tom Spence is a dom fule and doesn't know a fen nightingale from a natterjack.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A frog or toad."
      ],
      "links": [
        [
          "frog",
          "frog"
        ],
        [
          "toad",
          "toad"
        ]
      ],
      "raw_glosses": [
        "(UK, slang, archaic) A frog or toad."
      ],
      "tags": [
        "UK",
        "archaic",
        "slang"
      ]
    }
  ],
  "word": "fen nightingale"
}