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New-ish Light Shed on Basic Phorusrhacid Call Structure
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Topic Started: Aug 4 2017, 09:30 PM (418 Views)
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Dr Nitwhite
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Aug 4 2017, 09:30 PM
Post #1
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Not sure if any of you have seen this (it is two years old after all, so perhaps it was already posted [nothing showed up in my searches]), but I found it pretty interesting. Essentially, by looking at the structure of a very well preserved inner ear (on a fairly new species of phorusrhacid, Lallawavis scagliai), it was determined that these birds had a very narrow range of hearing at low sound frequencies, but which they should have been able to detect well. This lends evidence that their calls, if they used many vocalizations, would have been very deep, and possibly that their prey species would have had similarly deep calls.
http://www.eartharchives.org/articles/terror-birds-had-booming-calls/
2015 paper- http://www.tandfonline.com/doi/abs/10.1080/02724634.2014.912656 (unfortunately abstract only, the paper is behind a pay wall)
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Final SE Lifelist standings 1. Sayornis (82) 2. Dr Nitwhite (79) ↑ 3. Steampunk FireFinch (44) ↓ 4. The Dodo (26) 5. W.C.K.D (23) 6. Sphenodon (21) 7. Sheather (19) 8. Beetleboy (19) 9. Thylacine (16) 10. Monster (15) 11. HangingTheif (15) 12. Aptornis (13) 13. Stealth Rock (10) 14. KomradeWatcher (9) 15. lamna (7) 16. Flisch (5) 17. Olympianmaster (4) ↑ 18. Archipithecus (2) ↓ 19. Datura (1) ↓ 20. Giant Blue Anteater (1) ↓ 21. Kachimushi (1) BREAKING NEWS We interrupt your regular programming to bring you this cutting edge report. ATTENDANCE DROPS DRASTICALLY ON SE SERVER This past Monday on Discord, famous server Speculative Evolution took a hit in the attendance office when it's offline member list suddenly reappeared. Mods scrambled to rectify the situation, but unfortunately there was little anyone could do. Server member Ivan was asked what he thought of the situation. "So long as Flisch, lord of machines and scion of Urborg lives, all will be well". SE, (in)famous for it's eccentric userbase, has recently been spiraling downward, and now we have hard conformation of the decline. Moderator "High Lord" Icthyander states "There is nothing to be concerned about, Discord is merely changing its UI again", but members are beginning to suspect the honesty of their staff. Stay tuned, we'll be back with more at 11.
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LittleLazyLass
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Aug 4 2017, 11:09 PM
Post #2
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Not sure what it is about this study in particular, but I swear I've consistently seen people just now learning about it for about two years straight now since I heard it when the paper it. Anyway, better more people know, I guess.
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totally not British, b-baka!
You like me (Unlike) I don't even really like this song that much but the title is pretty relatable sometimes, I guess.
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Beetleboy
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Aug 5 2017, 04:37 AM
Post #3
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neither lizard nor boy nor beetle . . . but a little of all three
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Wow, cool. Thanks for sharing this!
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~ The Age of Forests ~
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kusanagi
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Aug 5 2017, 06:16 AM
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Someone compared the bill morphology to that of Gyps, Macronectes and Harpagornis. Not sure what prey they preferred but without a flying birds talons that prey was pretty small. Seriemas will smash small animals on the ground and other birds without large talons - such as skuas and large seagulls - will overpower comparatively large prey items by force. Even then the neck and skull of phorusrhacids are built to withstand vertical stresses not horizontal stress from large, powerful prey. This led to speculation the tip of the bill was used to strike but the skull was evolved to stand stress at mid length of the bill, not the tip. Conceivably feet were used as weapons also but most prey was small, else torn open alive, or they fed on carrion regularly.
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TAXESbutNano
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Aug 5 2017, 07:19 AM
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I'm going back to basics.
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- kusanagi
- Aug 5 2017, 06:16 AM
Someone compared the bill morphology to that of Gyps, Macronectes and Harpagornis. Not sure what prey they preferred but without a flying birds talons that prey was pretty small. Seriemas will smash small animals on the ground and other birds without large talons - such as skuas and large seagulls - will overpower comparatively large prey items by force. Even then the neck and skull of phorusrhacids are built to withstand vertical stresses not horizontal stress from large, powerful prey. This led to speculation the tip of the bill was used to strike but the skull was evolved to stand stress at mid length of the bill, not the tip. Conceivably feet were used as weapons also but most prey was small, else torn open alive, or they fed on carrion regularly. Unlikely- this is the exact same skull design used in theropods such as Allosaurus, which was designed to be used to cut through flesh while being driven by the powerful neck and leg musculature. It's likely that terror birds were the same, using whole-body strength to rip and tear flesh, while using their mobility to ensure stress remained on the vertical plane- they could just let go and readjust with another lunge if they couldn't. Duane Nash has a few good posts on the matter.
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kusanagi
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Aug 5 2017, 07:33 AM
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- Nanotyranus
- Aug 5 2017, 07:19 AM
- kusanagi
- Aug 5 2017, 06:16 AM
Someone compared the bill morphology to that of Gyps, Macronectes and Harpagornis. Not sure what prey they preferred but without a flying birds talons that prey was pretty small. Seriemas will smash small animals on the ground and other birds without large talons - such as skuas and large seagulls - will overpower comparatively large prey items by force. Even then the neck and skull of phorusrhacids are built to withstand vertical stresses not horizontal stress from large, powerful prey. This led to speculation the tip of the bill was used to strike but the skull was evolved to stand stress at mid length of the bill, not the tip. Conceivably feet were used as weapons also but most prey was small, else torn open alive, or they fed on carrion regularly.
Unlikely- this is the exact same skull design used in theropods such as Allosaurus, which was designed to be used to cut through flesh while being driven by the powerful neck and leg musculature. It's likely that terror birds were the same, using whole-body strength to rip and tear flesh, while using their mobility to ensure stress remained on the vertical plane- they could just let go and readjust with another lunge if they couldn't. Duane Nash has a few good posts on the matter. Yes I was thinking of Nash but there exist differences such as the lack of forearms and teeth. I never am sure how useful hooked bills are: flying raptors and owls use their feet primarily and raptors use their tongues to process meat. It would appear then that bills are inferior to claws or teeth at tearing or piercing flesh. Not saying the similarities to allosauroid dinosaurs aren't there, but the similarity is not perfect.
Edited by kusanagi, Aug 5 2017, 07:39 AM.
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Dr Nitwhite
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Aug 5 2017, 10:46 AM
Post #7
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- Little
- Aug 4 2017, 11:09 PM
Not sure what it is about this study in particular, but I swear I've consistently seen people just now learning about it for about two years straight now since I heard it when the paper it. Anyway, better more people know, I guess. Where these people on discord? I heard about it on a server there and I imagine it might have just been making the rounds there.
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Speculative Evolution Projects- The Great Song (5 myh, North America is filled with giant coots, life in the clouds, and the songs of human descendants. One curious society has devoted itself to the study of this world) The Curious World of Laniakea (An endless world of islands, shallow seas, mangrove swamps, and reefs) Hidden Spring (A partner project between myself and Beetleboy- exploring a future where a twist of cosmic fate changes the planet forever)
Other Relevant Work-
Final SE Lifelist standings 1. Sayornis (82) 2. Dr Nitwhite (79) ↑ 3. Steampunk FireFinch (44) ↓ 4. The Dodo (26) 5. W.C.K.D (23) 6. Sphenodon (21) 7. Sheather (19) 8. Beetleboy (19) 9. Thylacine (16) 10. Monster (15) 11. HangingTheif (15) 12. Aptornis (13) 13. Stealth Rock (10) 14. KomradeWatcher (9) 15. lamna (7) 16. Flisch (5) 17. Olympianmaster (4) ↑ 18. Archipithecus (2) ↓ 19. Datura (1) ↓ 20. Giant Blue Anteater (1) ↓ 21. Kachimushi (1) BREAKING NEWS We interrupt your regular programming to bring you this cutting edge report. ATTENDANCE DROPS DRASTICALLY ON SE SERVER This past Monday on Discord, famous server Speculative Evolution took a hit in the attendance office when it's offline member list suddenly reappeared. Mods scrambled to rectify the situation, but unfortunately there was little anyone could do. Server member Ivan was asked what he thought of the situation. "So long as Flisch, lord of machines and scion of Urborg lives, all will be well". SE, (in)famous for it's eccentric userbase, has recently been spiraling downward, and now we have hard conformation of the decline. Moderator "High Lord" Icthyander states "There is nothing to be concerned about, Discord is merely changing its UI again", but members are beginning to suspect the honesty of their staff. Stay tuned, we'll be back with more at 11.
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LittleLazyLass
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Aug 6 2017, 06:56 AM
Post #8
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Proud quilt in a bag
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I've heard people talking it now and then at various locations, but I don't remember seeing anything on our discord, just the Saurian one.
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totally not British, b-baka!
You like me (Unlike) I don't even really like this song that much but the title is pretty relatable sometimes, I guess.
Me  Forum user Uncanny Gemstar drew what is supposed to be a me. Thanks! Spoiler: click to toggle As they walk in, they're greeted by a small, poorly kept pathway leading to a poorly constructed Japanese-style gate. Behind this, a small field made up of corn, rice, wheat, potatoes, among other plants is contrasted by large piles of books, as well as a few rather out of place looking laptops. Off in the corner, a small woman, with long, striped, and strikingly colorful socks, no shoes, unremarkable denim shorts, a large, fancy black coat, arm warmers, glasses, a tuque, and somewhat unkempt, mid-length blue-and-pink-streaked red hair, is rummaging through a trash bin, located behind a sign saying "employees only". She continues this for a while (walking behind a wall to change her outfit now and then), until one of her visitors coughs. Startled, she looks up, apologizes, and grabs a handful of textbooks and novels before daintily running off to join them. What, you want me to tell you what these mean? Predenterra The (Lost) Lost World The Standing World Read First Clarifications on my sex and genderSorry if I come off as rude, I don't put much thought into word choice sometimes. I'm also super prone to editing my posts, sometimes multiple times, in the minutes following posting. For the love of god, take my posts from my earlier days on the forum with a grain of salt. I was not particularly knowledgeable or mature back then. Some of them are so cringe-worthy I can't even bring myself to look at them. Words Maybe Great Words - Words To Spec By
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It would have to be something extremely alien, pushing the limits of our imagination. But those are always my favorite kinds of life. ~~The Words of The Xenologist
- Words To Live By
-
Ignorance is never insulting if you're willing to learn, we're all ignorant about most things. ~~The Words of Lamna
- Words I Live By
-
Yeah, and even if you don't agree with creationists on that concept, that doesn't mean they can't be decent people. I have friends who are creationist (possibly even young earth) that I get along with fine in general life. I don't think they're right of course, but that doesn't make them intellectual degenerates. ~~The Words of forbidden3
Member Quotes - jman123
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Ass-breathing fish-lizards? Sounds like a punk rock band
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"Holy fucking shit a toilet paper roll! Our favorite thing!"
- Urufumarukai
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Tyrannosaurus aquastronka
- Kamineigh
-
Myo, if you don't stop reading the YouTube comments...
- Lamna
-
Are you saying what I think you're saying?
Sheather bathes in cum?
- Cephylus
-
And last night I dreamed I was blowing up a Kindergarten with a grenade launcher for no particular reason...
- revin
-
Oh, and of course more people get killed by selfies than by sharks. Of course.
- Parasky
-
SHEEEEAAAAATTTTTTHHHHHHHHHEEEEEEEEERRRRRRRRR!!!!!!!!
- whachamacalit2
-
The smell of rotting flesh really kills my appetite, surprising, but the visual appearance of corpses makes me hungry. Is that weird?
- Ebervalius
-
I mean, let us say I'm a genderfluid blurflux demi-romantic woman who is sexually attracted to men, but only if they are Melanesian and have a voice like that of Nicholas Cage. Okay, so what?
- trex841
-
When I first saw that picture, I thought you were dissecting a condom.
- Mr Mysterio
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All hail Robo-Stalin.
- Peashyjah
-
Seems like everything in this project is now dead.
- Stealth Rock
-
Seagulls are pretty much trees, right?
- Watcher
-
We all must finish chapters of our lives to go on to the next. Sometime this means leaving behind versions of ourselves that don't want to die.
- Yiqi15
-
For April fool's, we had to make an orgasm that resembled a human foot.
- Flisch
-
im the black market
- CaledonianWarrior96
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He was a skater birb, she said tweet you later birb
- Most People at Some Point
-
Quotes - Some dude called plucas1 from Youtube comments
-
Funny, isn't it, that our world needs Clark Kent a lot more than Superman.
- Xenoblade Chronicles
-
Even though he is our creator, that does not afford him the right to take our lives on a whim. But that is the thinking of a homs. He is a god. Such morals cannot apply to gods. So you think we should just shut up and die?! If that is the fate decided by a god. You are mistaken if you think we will simply accept such a fate and wait to die. We'll never stop fighting. Not till the end. To Zanza, the outcome is the same. Thus your logic is flawed.
- Hades - Kid Icarus Uprising
-
When freaky aliens give you lemons, make freaky alien lemonade.
- Kid Icarus Uprising
-
But Souls are delicious. They're like bacon - they taste good on anything. But if you eat them, you completely remove them from existence! They can't move on or... or be reincarnated! Huh. I never really gave it much thought. Besides, what do you mean by reincarnation anyway? You know, being reborn as someone or something else. Which means different body, different memories, different experiences, yes? So isn't being reborn as "something else" the same as being "removed from existence"? I... I... eating souls isn't right! That depends on your definition of "right". All living things survive by eating other living things. So what? You're a god. You should be above all that! Gods are above living things, which doesn't necessarily mean we care about them.
- Some Dude on BBC Two
-
You are being shagged... by a flightless parrot.
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