birdwatchinghq.com Rank 258K. Estimated value 8,436$worldbirds.org Rank 158.1K. Estimated value 13,812$birdsinbackyards.net Rank 1M. Estimated value 2,208$birdwatchireland.ie Rank 5.5M. Estimated value 384$birdfan.net Rank 1.5M. Estimated value 1,392$biodiversity4all.org Rank 673.9K. Estimated value 3,204$aba.org Rank 618K. Estimated value 3,492$morebirds.com Rank 2.1M. Estimated value 1,008$whatbird.com Rank 1.2M. Estimated value 1,812$birdbreeders.com Rank 680.3K. Estimated value 3,168$