Introduction to Animal Unit (AU) Concepts for Production of Sheep and Goats
A Birder's Online Toolbox — BBA
Bird Counting 201 - eBird
PDF) Estimating shorebird numbers at migration stopover sites
Mean flock size as a function of the total population of redshanks
Recent research shows importance of SC islands in migration of threatened red knots
How to Count Birds : Help Center
Counting Shorebirds: Tools, Tips, And Tricks
Long-range UAVs for anti-poaching solutions and wildlife application.
how many birds our in a starling flock
Survey Techniques and Protocols