At the time of creation all the following source images were licenced under CC0 on iNaturalist. The original observations can be found under the following links (not in order as they appear in the grid image):

https://www.inaturalist.org/observations/88445401 https://www.inaturalist.org/observations/83153918 https://www.inaturalist.org/observations/73536885 https://www.inaturalist.org/observations/64542283 https://www.inaturalist.org/observations/38467997 https://www.inaturalist.org/observations/88374475 https://www.inaturalist.org/observations/88379659 https://www.inaturalist.org/observations/81732343 https://www.inaturalist.org/observations/89051013 https://www.inaturalist.org/observations/89023816 https://www.inaturalist.org/observations/88448026 https://www.inaturalist.org/observations/88442344 https://www.inaturalist.org/observations/89129411 https://www.inaturalist.org/observations/89280531 https://www.inaturalist.org/observations/89072675 https://www.inaturalist.org/observations/88359820 https://www.inaturalist.org/observations/88012100 https://www.inaturalist.org/observations/78066594 https://www.inaturalist.org/observations/77470627 https://www.inaturalist.org/observations/83347430 https://www.inaturalist.org/observations/83110190 https://www.inaturalist.org/observations/85955121 https://www.inaturalist.org/observations/79224080 https://www.inaturalist.org/observations/78389209 https://www.inaturalist.org/observations/42519739