The gang celebrates their 6th anniversary by taking some time to talk about two papers about early mammal ecology. The first paper looks at some unique traces left by Mesozoic mammals, while the second paper attempts to determine how early mammals might have chewed their food. Meanwhile, James has made friends with his new Eevee named DMX, Amanda finds the fuel to sustain herself, and Curt imagines some tactical mammal stealth action.

(EDITOR'S NOTE: If you're wondering if Curt went all the way into making a complete edit on that song near the end….. of course he did: https://www.youtube.com/watch?v=d-fs-Qx8W18 )

Up-Goer Five (James Edition):

Today the group looks at two papers dealing with animals with warm blood and hair and looking at how they lived a long time ago. The first paper is looking at tracks of animals with hair that look a bit weird, with one side pushing down more than the other. The people studying the tracks think that they could have been made by an animal with hair carrying babies on it. This would be interesting as it would suggest that the animals with hair looked after their babies and let them drink warm white wet stuff from their bodies even this long ago. In order to see whether the tracks were made by an animal with hair that carried babies, the people writing the paper took an animal with hair that eats things people throw out but people also keep as animal friends and stuck things to it to make it carry them as if it was carrying babies to see if when it tried to walk it made tracks like they see in the rocks. It really just wanted to lie down but when it did walk it made tracks just like they see in the rock from a long time ago! The second paper is looking at how animals with hair that are around today eat their food and seeing how much it is the same or different to how animals with hair a long time ago ate. They show that they eat a way that we were not thinking they would and actually roll their mouth when biting, and that some of our strangest animals with hair that are part of an older group than most of our other animals with hair actually eat the same was as animals with hair from a very long time ago ate.

References:

Kuznetsov, Alexander N., and Aleksandra A. Panyutina. "First Paleoichnological Evidence for Baby–Riding in Early Mammals." Ameghiniana 55.6 (2018): 668-677.

Bhullar, Bhart-Anjan S., et al. "Rolling of the jaw is essential for mammalian chewing and tribosphenic molar function." Nature (2019): 1.

Pokemon and "Pokemon: Let's Go Eevee" are the properties of Nintendo, Creatures, and Game Freak ; "X Gonna Give It To Ya" by DMX owned by Def Jam and the Universal Music Group.