Read an article in the news this week:
"About 200 million years ago, a leech released a slimy mucous cocoon that unwittingly encased and trapped a bizarre animal with a springy tail, preserving it until researchers discovered the teardrop-shaped creature in Antarctica recently."
Interesting... but not what caught my eye. The money shot is this:
"This bell animal lived during the Late Triassic Period, when the Earth was much warmer, with dense rain forests flourishing along what is today the Transantarctic Mountain Range where it was found."