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All right, this has four legs, so a predator with four legs. And let's see where the hole in the foramen magnum is. SERENA BRADY: Yeah, yep, definitely a predator. It's definitely got to be a predator of some sort. VICTORIA DICAMILLO: It's definitely different. VICTORIA DICAMILLO: Oh, wow, the eyes are on the front this time. What else do we know about it? It's got pointy teeth, so it's a carnivore. So it has to be a carnivore because it has huge canines. Jeez, all right, so it has really sharp canines. VICTORIA DICAMILLO: Ew, look at those teeth. VICTORIA DICAMILLO: Oh, this one's really different. Oh, my god, is this like an animal graveyard or something? VICTORIA DICAMILLO: Wow, there's another one. VICTORIA DICAMILLO: And one of the few swimming mammals. VICTORIA DICAMILLO: Yeah, and long flat tails so they can propel themselves through the water. They also have these feet that have webbing in between them, so they can push, right? And beavers also swim, which would make sense with eyes on the top of the head so they can see when they're underwater. VICTORIA DICAMILLO: It makes a lot of sense. He's got to cut down trees with those things. VICTORIA DICAMILLO: The teeth keep growing. VICTORIA DICAMILLO: To be able to see when it's swimming. VICTORIA DICAMILLO: Beaver, that would fit- eyes on the top of the head, right? VICTORIA DICAMILLO: OK, well, if it's this large, these are rodents that are very large that could possibly live in this area- definitely not a rat or mouse, so definitely not a rat. So that's the hole in the back of the skull. SERENA BRADY: So it's still a prey species. But it's still not completely in the front of the skull. That's definitely different than the other herbivore we looked at, the dear. VICTORIA DICAMILLO: The eyes are on the top of the head? VICTORIA DICAMILLO: Well, What else can we learn about it though? SERENA BRADY: I don't think this is a mouse. VICTORIA DICAMILLO: It's a huge rodent though. VICTORIA DICAMILLO: Rodents definitely do. I mean, OK, so something that has a really long front teeth- what kind of things have really long front teeth? Hm. SERENA BRADY: Right, because really flat teeth, really sharp incisors, no canines. VICTORIA DICAMILLO: Oh, my god, they're like two inches long. SERENA BRADY: Look at the incisors on this thing.
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VICTORIA DICAMILLO: Ew, it has huge yellow teeth, gross. SERENA BRADY: We've stumbled upon a graveyard. VICTORIA DICAMILLO: Let somebody else find it. They're really, really cool and very graceful. I'm like, how can you stand on two toes? Well, then you watch them run, and you realize that it makes them really fast because they've got these long legs that keep going. And they got these nice long legs that kind of like go on forever. VICTORIA DICAMILLO: OK, so there are these deer that live outside my apartment. VICTORIA DICAMILLO: A deer- ah, dear are so awesome. SERENA BRADY: I think it might be a deer. VICTORIA DICAMILLO: Well, if it was found around here, maybe it lived around here too. SERENA BRADY: Yeah, so this animal had to have four legs. VICTORIA DICAMILLO: Just like up and down? And so if you simply place your finger in it, you can see that it was more horizontal instead of like us, which is we walk like this. And it's where the spine meets the skull. VICTORIA DICAMILLO: How can you tell that from the skull? All right, and then you want to know if it had two legs or four. So that must mean it's an herbivore, because it has no canine teeth. Good, yeah, that's a really good observation. VICTORIA DICAMILLO: Yeah, there's no sharp teeth though. The molars and the premolars are more flat. SERENA BRADY: Yeah, they're kind of flat, so that must mean that they're more for grinding. VICTORIA DICAMILLO: Ew, they're so weirdly shaped. All right, so then what else? Let's look at the teeth. VICTORIA DICAMILLO: So having the eyes like this. So it needs to be able to see predators sneaking up on it. So that must mean it's a prey species, because it has to have better peripheral vision. SERENA BRADY: Yeah, yeah, those are the orbits. VICTORIA DICAMILLO: So these are the eyes? OK, so the eyes are on the sides of the head. VICTORIA DICAMILLO: Oh, my god, look at that. VICTORIA DICAMILLO: All right, come on, Serena. VICTORIA DICAMILLO: Let's see if we can find something. SERENA BRADY: You know there's always a chance that we'll find something. VICTORIA DICAMILLO: A nice walk in the woods, I wonder if we'll find anything today. VICTORIA DICAMILLO: Oh, man, I'm so excited. And I'm going to tell you guys today how I determined that it was a fox skull. And my mom and I looked through a book, and we found out that it was a fox skull. And when I was younger, I was walking through the woods. And I'm really interested in animal skulls.