[
  {
    "id": "source-echo",
    "title": "大棕蝠与回声定位",
    "facts": "翼展 33–40 cm；双翼与延长的指骨；回声定位原理。",
    "links": [
      {
        "title": "NPS · Bats ↗",
        "url": "https://www.nps.gov/brca/learn/nature/bats.htm"
      },
      {
        "title": "NPS · Echolocation ↗",
        "url": "https://www.nps.gov/subjects/bats/echolocation.htm"
      },
      {
        "title": "NPS · Wing anatomy ↗",
        "url": "https://www.nps.gov/mora/learn/nature/bats.htm"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-speed",
    "title": "回声距离模型",
    "facts": "声速取约 20°C 下 343\n                m/s。距离滑杆与声信号为简化模型，不是动物追踪数据。",
    "links": [
      {
        "title": "National Weather Service · Speed of Sound ↗",
        "url": "https://www.weather.gov/epz/wxcalc_speedofsound"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-owl",
    "title": "横斑林鸮",
    "facts": "体长 43–50 cm；圆头、深色眼睛、胸腹斑纹与活动习性。",
    "links": [
      {
        "title": "Cornell Lab · Barred Owl ↗",
        "url": "https://www.allaboutbirds.org/guide/Barred_Owl/id"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-audio",
    "title": "真实夜声录音",
    "facts": "「A Barred Owl」由美国国家公园管理局发布；Saint Croix National\n                Scenic Riverway，2011-06-25。保留原始音频，约 54\n                秒；未将其标作插画场景的现场录音。",
    "links": [
      {
        "title": "NPS · Natural Sounds ↗",
        "url": "https://www.nps.gov/sacn/learn/nature/natural-sounds.htm"
      },
      {
        "title": "下载原始音频 ↓",
        "url": "assets/barred-owl.mp3"
      },
      {
        "title": "NPS · 使用说明 ↗",
        "url": "https://www.nps.gov/aboutus/disclaimer.htm"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-fireflies",
    "title": "同步萤火虫的信号与发光",
    "facts": "Photinus carolinus：通常 5–8 次闪光，接约 8\n                秒暗期。展览取六次短闪；闪光持续时间、间隔与光点位置为说明而设。未使用种群监测数据。",
    "links": [
      {
        "title": "NPS · Synchronous Fireflies ↗",
        "url": "https://www.nps.gov/grsm/learn/nature/fireflies.htm"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-salamander",
    "title": "东部红背蝾螈",
    "facts": "Plethodon cinereus：无肺、经皮肤与黏膜呼吸；陆栖生活与红背色型。",
    "links": [
      {
        "title": "Minnesota DNR · Eastern red-backed salamander ↗",
        "url": "https://www.dnr.state.mn.us/reptiles_amphibians/salamanders-red_backed.html"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-habitat",
    "title": "林下的隐蔽空间",
    "facts": "无肺蝾螈的气体交换与落叶、石块、倒木下的栖息环境。",
    "links": [
      {
        "title": "NPS · Amphibians ↗",
        "url": "https://www.nps.gov/grsm/learn/nature/amphibians.htm"
      }
    ],
    "accessed": "2026-09-13"
  },
  {
    "id": "source-night",
    "title": "为森林留下黑暗",
    "facts": "人工照明对萤火虫求偶信号的干扰。",
    "links": [
      {
        "title": "NPS · Lightscape ↗",
        "url": "https://www.nps.gov/ozar/learn/nature/lightscape.htm"
      }
    ],
    "accessed": "2026-09-13"
  }
]