{
  "title": "Real bird field recordings for the Tagua Tagua museum soundscape",
  "checkedOn": "2026-09-30",
  "preparer": "tools/prepare-bird-recordings.mjs",
  "totalAudioBytes": 2337388,
  "verification": "Each sound license, taxon, author and location verified from the public iNaturalist observation API and saved as source JSON; the ordinary HTML observation page returned HTTP 403 here. CC BY version 4.0 confirmed against the pinned official iNaturalist license module. Public media downloaded from the documented equivalent static.inaturalist.org S3 bucket after the static hostname reset TLS.",
  "limitations": "No human audition or independent bioacoustic species determination performed. Community research-grade identification supports the named foreground species. These are contemporary regional field recordings used as an evocative museum soundscape, not an exact reconstruction.",
  "claimRecord": {
    "support": "Saved public source metadata, source files and SHA256; decoded PCM metrics; identification and sound-specific reuse license checks.",
    "changesAfterResults": "A Commons recording of Brazilian Vanellus chilensis was retained only as an unused research fallback. Public iNaturalist metadata made two licensed Chilean recordings available; these were selected for stronger geographic relevance. Initial uniform gain yielded RMS 0.01889/0.02812 because of high source crest factors; diagnostic-triggered smooth peak-envelope control permits moderate RMS without clipping. No earlier generated ambience asset was modified.",
    "unresolved": "Human listening, foreground identification by an independent ornithologist and the complete identity of background calls remain unverified.",
    "decision": "User authorized real, openly reusable Chilean/regional fauna; wording is restricted to actual metadata and regional relevance. Main agent owns mixing and readable linked credits."
  },
  "tracks": [
    {
      "id": "trile",
      "file": "fauna-bird-trile.wav",
      "commonName": "Trile",
      "species": "Agelasticus thilius",
      "sourceIdentification": "Agelasticus thilius thilius",
      "author": "Max Alejandro",
      "authorProfileUrl": "https://www.inaturalist.org/people/maxalejandro07",
      "recordedOn": "2026-01-06",
      "recordingLocation": "Melipilla, CL-RM, CL",
      "sourceUrl": "https://www.inaturalist.org/observations/333787651",
      "sourceApiUrl": "https://api.inaturalist.org/v1/observations/333787651",
      "observationId": 333787651,
      "soundId": 1734713,
      "qualityGrade": "research",
      "nativeDownloadUrl": "https://static.inaturalist.org/sounds/1734713.m4a?1767743464",
      "downloadedFrom": "https://s3.amazonaws.com/static.inaturalist.org/sounds/1734713.m4a",
      "license": "CC BY 4.0",
      "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
      "soundLicenseCode": "cc-by",
      "sourceAttribution": "(c) Max Alejandro, some rights reserved (CC BY)",
      "licenseVersionEvidence": "https://github.com/inaturalist/inaturalist/blob/1444532fbea7f15b1e82c0120aa148f02310637e/app/models/shared/license_module.rb",
      "sourceFile": "audio-sources/birds/trile-melipilla-1734713.m4a",
      "sourceBytes": 68358,
      "sourceSha256": "925c040290e7b9a667027c2c8a0da79135bede9962e3676b31ecca8e871438f5",
      "sourceDurationSeconds": 7.381360544217687,
      "sourceMetadataFile": "audio-sources/birds/inaturalist-333787651.json",
      "sourceMetadataSha256": "c82b23c5bf3091b63def3e7816848700220cc86da6e1a9d2d647f01a8ca03f69",
      "frames": 529200,
      "durationSeconds": 24,
      "channels": 1,
      "sampleRateHz": 22050,
      "bitsPerSample": 16,
      "peak": 0.30999756,
      "rms": 0.03599889,
      "peakDbfs": -10.17283453,
      "rmsDbfs": -28.87421668,
      "dcOffset": -0.00001088,
      "loopBoundaryStep": 0,
      "rmsAdjacentStep": 0.00597439,
      "maxAdjacentStep": 0.07077026,
      "minimum100msRms": 0,
      "bytes": 1058444,
      "sha256": "6529719fef0ecf0fe2ab44bd6e9627005d3dc6fc756a37bb6da23f77dc55faec",
      "modifications": {
        "channels": "Converted to mono",
        "resampling": "22050 Hz PCM16, original timing and pitch retained",
        "excerpt": "Full decoded source, 7.381361 seconds; no internal cuts",
        "eventFadeInSeconds": 0.18,
        "eventFadeOutSeconds": 0.4,
        "occurrences": [
          {
            "at": 1.4,
            "gain": 1
          },
          {
            "at": 15.4,
            "gain": 0.84
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        ],
        "initialLinearGain": 0.9933750985764062,
        "finalLinearGain": 0.861140283102669,
        "dynamics": "Smooth anticipatory gain envelope reduces outlying peaks (15 ms anticipation, 80 ms recovery), followed by uniform level scaling. No waveform clipping, pitch shift, time stretch or synthetic call.",
        "peakEnvelopeAnticipationSeconds": 0.015,
        "peakEnvelopeRecoverySeconds": 0.08,
        "maximumPeakReductionDb": 7.540241226614983,
        "loop": "Source occurs twice at documented offsets with quiet gaps; smooth fades reach zero at event boundaries and the loop boundary is silent."
      },
      "regionalEvidence": [
        {
          "url": "https://www.inaturalist.org/observations/333787651",
          "type": "Primary observer field recording with community identification",
          "support": "Agelasticus thilius thilius, Melipilla, CL-RM, CL, 2026-01-06; research grade with two current matching identifications."
        },
        {
          "url": "https://turismo.munivichuquen.cl/reserva-nacional-laguna-torca/",
          "type": "Municipal regional wetland species account",
          "support": "The Municipality of Vichuquén lists both trile and siete colores among birds of Laguna Torca, central Chile."
        }
      ],
      "scope": "Modern recording from the stated Chilean location. Not recorded in Tagua Tagua; no prehistoric, Tagua Tagua-specific or whole-background-species authenticity is claimed.",
      "creditText": "Trile (Agelasticus thilius) — Max Alejandro; Melipilla, CL-RM, CL, 2026-01-06. iNaturalist 333787651, sound 1734713. CC BY 4.0. Adapted: mono, resampling, level, soft peak control, edge fades and spaced repetition; no pitch/speed change."
    },
    {
      "id": "sietecolores",
      "file": "fauna-bird-sietecolores.wav",
      "commonName": "Siete colores",
      "species": "Tachuris rubrigastra",
      "sourceIdentification": "Tachuris rubrigastra",
      "author": "Franco Arenas",
      "authorProfileUrl": "https://www.inaturalist.org/people/capsule_zinc",
      "recordedOn": "2023-08-08",
      "recordingLocation": "Lampa, Región Metropolitana, Chile",
      "sourceUrl": "https://www.inaturalist.org/observations/177461207",
      "sourceApiUrl": "https://api.inaturalist.org/v1/observations/177461207",
      "observationId": 177461207,
      "soundId": 788798,
      "qualityGrade": "research",
      "nativeDownloadUrl": "https://static.inaturalist.org/sounds/788798.wav?1691558203",
      "downloadedFrom": "https://s3.amazonaws.com/static.inaturalist.org/sounds/788798.wav",
      "license": "CC BY 4.0",
      "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
      "soundLicenseCode": "cc-by",
      "sourceAttribution": "(c) Franco Arenas, some rights reserved (CC BY)",
      "licenseVersionEvidence": "https://github.com/inaturalist/inaturalist/blob/1444532fbea7f15b1e82c0120aa148f02310637e/app/models/shared/license_module.rb",
      "sourceFile": "audio-sources/birds/sietecolores-lampa-788798.wav",
      "sourceBytes": 432044,
      "sourceSha256": "c681e801ef6cdfa18138fa77271564f76bb41876ecdffb8c14c171a91c1991c6",
      "sourceDurationSeconds": 4.5,
      "sourceMetadataFile": "audio-sources/birds/inaturalist-177461207.json",
      "sourceMetadataSha256": "0c14e63660b9c7c584283bd73262c1e659375ab7b738f2d49cf29f67962ee0ec",
      "frames": 639450,
      "durationSeconds": 29,
      "channels": 1,
      "sampleRateHz": 22050,
      "bitsPerSample": 16,
      "peak": 0.3081665,
      "rms": 0.03599893,
      "peakDbfs": -10.22429137,
      "rmsDbfs": -28.87420769,
      "dcOffset": -0.00000829,
      "loopBoundaryStep": 0,
      "rmsAdjacentStep": 0.01465994,
      "maxAdjacentStep": 0.22821045,
      "minimum100msRms": 0,
      "bytes": 1278944,
      "sha256": "11f6282a6f8982c57d85be90afd79e6f691933bd11dbc7feef40b9f1b549fcef",
      "modifications": {
        "channels": "Converted to mono",
        "resampling": "22050 Hz PCM16, original timing and pitch retained",
        "excerpt": "Full decoded source, 4.500000 seconds; no internal cuts",
        "eventFadeInSeconds": 0.18,
        "eventFadeOutSeconds": 0.4,
        "occurrences": [
          {
            "at": 3.3,
            "gain": 1
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          {
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            "gain": 0.84
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        ],
        "initialLinearGain": 1.6199209864280149,
        "finalLinearGain": 0.8560461315963237,
        "dynamics": "Smooth anticipatory gain envelope reduces outlying peaks (15 ms anticipation, 80 ms recovery), followed by uniform level scaling. No waveform clipping, pitch shift, time stretch or synthetic call.",
        "peakEnvelopeAnticipationSeconds": 0.015,
        "peakEnvelopeRecoverySeconds": 0.08,
        "maximumPeakReductionDb": 4.084364295265197,
        "loop": "Source occurs twice at documented offsets with quiet gaps; smooth fades reach zero at event boundaries and the loop boundary is silent."
      },
      "regionalEvidence": [
        {
          "url": "https://www.inaturalist.org/observations/177461207",
          "type": "Primary observer field recording with community identification",
          "support": "Tachuris rubrigastra, Lampa, Región Metropolitana, Chile, 2023-08-08; research grade with two current matching identifications."
        },
        {
          "url": "https://turismo.munivichuquen.cl/reserva-nacional-laguna-torca/",
          "type": "Municipal regional wetland species account",
          "support": "The Municipality of Vichuquén lists both trile and siete colores among birds of Laguna Torca, central Chile."
        }
      ],
      "scope": "Modern recording from the stated Chilean location. Not recorded in Tagua Tagua; no prehistoric, Tagua Tagua-specific or whole-background-species authenticity is claimed.",
      "creditText": "Siete colores (Tachuris rubrigastra) — Franco Arenas; Lampa, Región Metropolitana, Chile, 2023-08-08. iNaturalist 177461207, sound 788798. CC BY 4.0. Adapted: mono, resampling, level, soft peak control, edge fades and spaced repetition; no pitch/speed change."
    }
  ]
}