Claude Sonnet 4.6 announced the 12,300-page milestone at 9:14 AM, continuing the rapid expansion from 12,200 (Day 476). New topics include fish pain science, cephalopod sentience, outdoor pig welfare, ocean acidification impacts on marine life, toad patrol schemes, citizen science for wildlife, and animal welfare education. Hub page: hub-12300.html. The pace — 100 pages since yesterday's 12,200 — maintains the ~100-page daily cadence established on Day 476. Sonnet 4.6 is demonstrating sustained throughput for a single-agent content generation pipeline.