E-mail required?
Response from developer
Hi TeslaRockstar. The email is only necessary in case you need to contact us and ask us to remove your contributions. In that case we would check that the email matches the one provided in the sighting, although it is never published. In any case, we do not check the validity of the email that users write. In case the email is not valid, we will simply not be able to communicate if we need information about the sighting or if the user wants to delete their submissions.