Figure 1. The rarest of rare fossils finds: Two more-than-friends having a sleepover. Credit to Fernandez et al. 2013. The title of the paper tells it all. A cynodont sleeping with an injured amphibian, in other words a pre-Piggie sleeping with a pre-Kermit.
References
Fernandez V, Abdala F, Carlson KJ, Cook DC, Rubidge BS, Yates A and Tafforeau P 2013. Synchrotron Reveals Early Triassic Odd Couple: Injured Amphibian and Aestivating Therapsid Share Burrow. PLoS ONE 8(6): e64978. doi:10.1371/journal.pone.0064978.
The Pterosaur Heresies 