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Hadrosaurs occasionally ate crustaceans within rotting wood
Topic Started: Sep 22 2017, 11:02 AM (722 Views)
Yiqi15
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Consumption of crustaceans by megaherbivorous dinosaurs: dietary flexibility and dinosaur life history strategies

https://qz.com/1084199/dinosaurs-who-were-vegetarian-probably-cheated-with-shellfish/

https://www.newscientist.com/article/2148143-dinosaurs-that-seemed-veggie-also-ate-the-odd-bit-of-shellfish/

I honestly think the hadrosaur just ate the rotten wood that just so happened to have crustaceans in them and never intentionally ate them. The paleontologist does suggest hadrosaurs may have done so seasonally or when food was scarce.
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Ebervalius
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I agree. I don't think they'd do this on purpose.
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Carlos
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Modern megafaunal herbivores scavenge and deer eat seabirds and squirrels, so...
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JohnFaa
Sep 22 2017, 01:19 PM
Modern megafaunal herbivores scavenge and deer eat seabirds and squirrels, so...
At least we have hard evidence of that kind of behavior in dinosaurian herbivores, no longer just the analogue to justify depictions of it.
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trex841
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I remember March of the Dinosaurs also showed Edmontosaurus (and an ankylosaur) eating grubs in rotten wood during winter months

(skip to 13 minutes in)

Though the commentary does leave it ambiguous as to weather they are claiming this was purposeful behavior, or if it was simply a side effect of searching for food.
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trex841
Sep 22 2017, 06:25 PM
I remember March of the Dinosaurs also showed Edmontosaurus (and an ankylosaur) eating grubs in rotten wood during winter months

(skip to 13 minutes in)

Though the commentary does leave it ambiguous as to weather they are claiming this was purposeful behavior, or if it was simply a side effect of searching for food.
They said that they were doing this to get a little more protein for them to survive.
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Tartarus
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While this could have been merely a case of the crustaceans being in the wrong place at the wrong time, the fact that present day plant eaters have been known to sometimes feed on other animals (generally in cases where they are not getting enough of a certain mineral or other thing they need) means that its not really so outrageous to think that the hadrosaurs may have been deliberately snacking on them.
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trex841
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peashyjah
Sep 22 2017, 07:52 PM
trex841
Sep 22 2017, 06:25 PM
I remember March of the Dinosaurs also showed Edmontosaurus (and an ankylosaur) eating grubs in rotten wood during winter months

(skip to 13 minutes in)

Though the commentary does leave it ambiguous as to weather they are claiming this was purposeful behavior, or if it was simply a side effect of searching for food.
They said that they were doing this to get a little more protein for them to survive.
Not really, they said it "helped", but kind of danced around weather they were eating it because of the grubs, or because it was the only plant matter left in the area.
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LittleLazyLass
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The paper specifically goes into the fact that this was almost certainly voluntary digestion. Birds apparently spit out unfavorable foods, and this isn't just one individual or something. This is a surprisingly high percentage of the studied coprolites from multiple locations at different times. Here's the paper, by the way, just read it. It's not super technical stuff and some of the stuff is hard to really translate into a news article properly.

Also, we're not sure these were hadrosaurs. Again, we're working with corprolites, and the only thing pointing to hadrosaurs over ceratopsids is that their teeth were maybe more adapted to eating crabs or something.
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trex841
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Oh, I was only referring to the video. I got busy with other things, I forgot to read the article.
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maybe these are jubeniles coprolites and they were omnivores during the first years of lifeand then they eat more and more plants
or therere is an unknown lineage of omnivore ornitoschians/ornitopods somewhere ;)
or are we sure it couldn´t be a theropod

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LittleLazyLass
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maybe these are jubeniles coprolites and they were omnivores during the first years of lifeand then they eat more and more plants
Given the size of some of the crustaceans, it seems unlikely juveniles were the ones who created the coprolites.
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Carlos
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Unlike birds, though, hadrosaurs were not selective eaters. They have broad jaws filled with tooth batteries for a reason...
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