Are there 400 billion birds? - Birdful Factoring in non-breeding birds, the study authors estimate 74 billion individual birds globally This aligns with their modeled estimate of 50 billion breeding pairs So continental totals do not directly add up to the global 400 billion estimate
How are bird populations estimated? - Birdful Species with quiet or cryptic displays can be difficult to map precisely Capture-Mark-Recapture This method involves capturing, marking with bands or tags, and releasing birds during multiple sampling occasions Recaptured individuals are noted Mark-recapture analysis then uses the ratios of marked to unmarked birds to estimate population size
Bird Deaths In Numbers: Most Prominent Treats Causes The first year of life is the most deadly to birds across all species Estimates of first year bird deaths vary from species to species – from 20 and 30 percent in waterfowl to 83 percent for songbirds What is the survival rate of baby birds? An average baby bird’s survival is roughly 56 percent The survival rate is highly dependent on
How many species are there? - Our World in Data One of the most widely cited figures comes from Camilo Mora and colleagues; they estimated that there are around 8 7 million species on Earth today 4 Costello et al (2013) estimate 5 ± 3 million species; Chapman (2009) estimate 11 million; and after reviewing the range in the literature, Scheffers et al (2012) choose not to give a concrete
Our Favorite Bird Books of 2023 - 10,000 Birds Both guides contain Howell’s expert species descriptions and Dyer’s beautiful scientific illustrations—an unbeatable combination There is a bit of controversy about these guides—they utilize a taxonomy partially crafted by the authors that emphasizes splits and new names for some familiar birds