Photo reference : https://www.eatingintranslation.com/2013/07/skate-egg-cases.html

Photo reference : https://ngthai.com/animals/9863/sharks-in-peril/

Photo reference : http://tywkiwdbi.blogspot.com/2009/03/shark-egg-case.html?m=1

Photo reference : https://www.dmcr.go.th/detailAll/3411/nws/22

Photo reference : http://www.beachstuff.uk/eggs_and_egg_cases.html

Photo reference : https://th.m.wikipedia.org/wiki/ปลากระเบนค้างคาว

Photo reference : http://www.beachstuff.uk/eggs_and_egg_cases.html

Photo reference : https://en.m.wikipedia.org/wiki/Undulate_ray

Photo reference : http://www.beachstuff.uk/eggs_and_egg_cases.html

Photo reference : https://www.planetseafishing.com/ray-cuckoo/

Photo reference : http://www.beachstuff.uk/eggs_and_egg_cases.html

Photo reference : https://www.wildlifetrusts.org/wildlife-explorer/marine/fish-sharks-skates-and-rays/thornback-ray