Environment problem for Shells of snail

August 19, 2018 my obseration in Shatin Park.
Broken-Shells of 2 snails were found that I felt abnormal …

We knew that egg shell would be too thin for hatching of bird when environment problem exist.

Any environment problem here for those shells of snail?

Posted on August 30, 2018 11:49 PM by alankwok