５月31日。
カタツムリ*1。国立科学博物館筑波実験植物園*2。
*1:See also https://sumita-m.hatenadiary.com/entry/20150715/1436887312 https://sumita-m.hatenadiary.com/entry/20161018/1476755443 https://sumita-m.hatenadiary.com/entry/20170129/1485699319 https://sumita-m.hatenadiary.com/entry/20170324/1490334079 https://sumita-m.hatenadiary.com/entry/20170327/1490581513 https://sumita-m.hatenadiary.com/entry/2019/02/21/030110
