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Citations:
https://www.npr.org/2015/09/03/434400838/warning-calls-decoded-squirrels-take-up-bird-alarms-to-foil-the-enemy
https://www.nationalgeographic.com/animals/article/nuthatches-chickadees-communication-danger
https://www.allaboutbirds.org/news/look-out-the-backyard-bird-alarm-call-network/#
https://www.audubon.org/news/a-beginners-guide-common-bird-sounds-and-what-they-mean
