"contact call" meaning in English

{
  "forms": [
    {
      "form": "contact calls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "contact call (plural contact calls)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English alliterative compounds",
          "parents": [
            "Alliterative compounds",
            "Alliterative phrases",
            "Compound terms",
            "Phrases",
            "Terms by etymology",
            "Lemmas",
            "Multiword terms"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Ornithology",
          "orig": "en:Ornithology",
          "parents": [
            "Zoology",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A call made between birds in a flock or a pair in order to maintain contact with one another when foraging, flying, etc."
      ],
      "id": "en-contact_call-en-noun-kOOd6Jqs",
      "links": [
        [
          "ornithology",
          "ornithology"
        ],
        [
          "call",
          "call"
        ]
      ],
      "raw_glosses": [
        "(ornithology) A call made between birds in a flock or a pair in order to maintain contact with one another when foraging, flying, etc."
      ],
      "topics": [
        "biology",
        "natural-sciences",
        "ornithology"
      ]
    }
  ],
  "word": "contact call"
}

{
  "forms": [
    {
      "form": "contact calls",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "contact call (plural contact calls)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English alliterative compounds",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Ornithology"
      ],
      "glosses": [
        "A call made between birds in a flock or a pair in order to maintain contact with one another when foraging, flying, etc."
      ],
      "links": [
        [
          "ornithology",
          "ornithology"
        ],
        [
          "call",
          "call"
        ]
      ],
      "raw_glosses": [
        "(ornithology) A call made between birds in a flock or a pair in order to maintain contact with one another when foraging, flying, etc."
      ],
      "topics": [
        "biology",
        "natural-sciences",
        "ornithology"
      ]
    }
  ],
  "word": "contact call"
}