Walking around a tropical forest it is not uncommon to come across unripened fruits on the floor. Trees will often abort the development of their offspring if deemed unlikely to reach adulthood as a plant, allowing them to fall and die.
iNaturalist is an online community where people can record and share observations. We have been using iNaturalist in our group for student projects. It’s proved a great way to teach how to collect and analyse data while the lab and field have been off-limits.