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What's Behind the Mysterious Irruptive Species Migration Patterns?

Some years it seems like certain species are much more common. One reason for this, is that those species may be "irruptive" meaning they may move in greater or lesser numbers depending on their food source that year. Gear Links (As Amazon Associates we do earn from qualifying purchases) Panasonic LUMIX FZ80 4K Digital Camera Used for most bird videos) - check credits as we do source some photos/videos elsewhere which is noted in the description https://amzn.to/3GZl3Mu Cayer FP2450 Fluid Head Tripod, 75 inches Aluminium Tripod Derek's lighter tripod https://amzn.to/3suX5CK Andoer Video Tripod Aluminum Alloy 67 Inch Derek's heavier tripod https://amzn.to/3uRLTTk Nikon D5300 Derek's vlogging and macro camera https://amzn.to/3HF8jeh Rode VideoMicPro Compact Directional On-Camera Microphone Derek's external microphone for Nikon D5300 https://amzn.to/3oH8YnS Connect with us! https://badgerlandbirding.wordpress.com   / badgerlandbirding     / badgerlandbirding     / badgerlandbirding  \ Cover image background by Jeff Hollet (Public Domain, edited) Male grosbeak in cover image by Keith Ramos/USFWS (Public Domain, edited) Female grosbeak in cover image by dfaulder (CC by 2.0, edited) https://creativecommons.org/licenses/... All other photos and videos by Derek and Ryan Sallmann #Birding #BirdWatching #BadgerlandBirding