Gastropoda

Inclusions are all the objects that are trapped in amber. It can be both organic and inorganic.
Over a thousand species of insects and crustacea have been found in it. The most familiar of these are insects and spiders, but there are many other things that have also been trapped. These include bacteria, fungi and many different types of plants such as botanical debris, carbonized wood, cones, needles, and bark. Invertebrate animals (those without backbones), include worms, snails. You can also find vertebrates, but these are extremely rare and consists of frogs, lizards, birds\' feathers and mammal remains.
Most insects are perfectly preserved inside of amber - the tiniest hairs and scales could be seen. Most of the insects were entrapped while being alive - sometimes were blown by the wind, sometimes a tree exuded bigger quantity of resin while they were sitting on the trunk. So there is sometimes evidence of a struggle, such as concentric lines in the amber around them. Some flies and harvestman spiders are able to break off their legs to enable their escape. Isolated legs are often seen in amber, as well as flies with some of their legs lying nearby. Some flies are trapped while still mating, whereas some isects lay eggs in amber just before dying.