An excellent post full of good photos and with a nostalgic touch for the house where you lived a long time ago. When bees or bumblebees are on the ground and not flying it is usually because they are dying, in my garden there are many bees and when they are dying they almost always enter the house, here I do not kill them but take them out of the house because in that state the bees are more susceptible to stinging. Surely the bumblebee served as food for ants or other animals that passed by.

If you need an application to help you identify plants or other living things you can use Inaturalist, it's a good filter that can give you approximations of the species, often it doesn't get it right but at least it helps to have references. Hope all goes well, happy week @agmoore.