Before the Carboniferous Era only plants had managed to colonize the land. Though as atmospheric oxygen levels continued to rise it made it possible for the first amphibians to truly set foot on land. These creatures became some of the first frogs, and still roam the Earth to this day. Their sensitivity to the surrounding environment makes them a great bellwether species, which is probably why you see so many in specimen jars like these being studied by scientists all over the world.
Frogs may have started out at the shore line and muddy environs of the world, but they have gone on to colonize just about every climate type and continent short of Antarctica. One of the most aspiring of all frogs is the green tree frog, which you see replicated as a vividly details prop in this Frog Specimen Jar.