Pine Bonsai by Bjorn Bjorholm – The Bonsai Seed

https://thebonsaiseed.com/pine-bonsai-by-bjorn-bjorholm

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Evaluating the population‐level impact of an invasive species, Ring‐necked Parakeet Psittacula krameri, on native avifauna – NEWSON – 2011 – Ibis – Wiley Online Library

https://onlinelibrary.wiley.com/doi/full/10.1111/j.1474-919X.2011.01121.x