Due to global warming, it seems that winter flowers such as camellias are blooming late in Japan this year. Japanese macaques love camellia petals and nectar. The yellow color around their mouths is probably due to the large amount of camellia pollen.
This is a simple mountain camellia that has bloomed in the mountains of Japan since ancient times.
[ps]
This is an excerpt from a paper that discusses the relationship between flowering time and global warming, etc..
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