On 12/25/2018 3:01 AM, Daud Deden wrote:
>
>>>>>>>>>>>>>> On 12/22/18 11:42 AM, Daud Deden wrote:
>>>>>>>>>>>>>>>> What does "orthograde" mean?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Eg. Bali duck vs Mallard duck posture.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> What about Presbyornis?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Per wiki picture, it had fully webbed toes like a dabbling duck,
>>>>>>>>>>>>>>> while upright wading birds tend to have slight or no webbing between
>>>>>>>>>>>>>>> long toes. Waders don't run off, they fly off.
>>>>>>>>>>>>>> What is the relevance? You asked for a herbivorous wader.
>>>>>>>>>>>>>
>>>>>>>>>>>>> I was specific: orthogonal upright (near-vertical spine) wading-birds.
>>>>>>>>>>>>> I'm familiar with screamers, they definitely don't match this, but they do make a racket.
>>>>>>>>>>>>
>>>>>>>>>>>> I'm not familiar with any orthogonal upright wading birds, offhand. What
>>>>>>>>>>>> are you thinking of?
>>>>>>>>>>>
>>>>>>>>>>> Herons, egrets, bitterns and other of similar traits.
>>>>>>>>>>
>>>>>>>>>> But they don't hold their bodies vertically, at least not usually. And
>>>>>>>>>> that's just one family.
>>>>>
>>>>> You have repeatedly used the term 'vertical' while I have stressed 'nearly vertical'. Even Picea is not perfectly vertical.
>>>>
>>>> I've repeatedly asked you for an operational definition.
>>>
>>>
>>> What does "orthograde" mean?
>>>
>>> Upright (spine) posture [eg. Penguin vs duck], vs pronograde.
>>>
>>> That answer would have sufficed an innocent inquiry.
>>
>> Nope. Not operational.
>
> Again, a political response.
> I suspect you are a computer program.
>
>>
>>> You have
>>>> repeatedly ignored that request. How vertical is "nearly vertical"?
>>>>
>>>>>>>>> If you don't distinguish between pronograde birds (spine nearly
>>>>>>>>> horizontal) and orthograde birds (spine nearly vertical) then our
>>>>>>>>> discussion is irrelevant.
>>>>>>>> When you say "spine", I presume you're referring to the synsacrum. Is
>>>>>>>> that correct? If so, what angle are you counting as the limit of
>>>>>>>> "orthograde"? If not, surely you aren't counting the cervical vertebrae,
>>>>>>>> are you?
>>>>>>>
>>>>>>> I'm referring to the spinal column within the torso, both typically
>>>>>>> orient pronograde (ducks except Bali ducks) or orthograde (large
>>>>>>> wading birds, penguins).
>>>>>> So, the synsacrum, then.
>>>>>
>>>>> Not my term.
>>>>
>>>> It's the term used by ornithologists, though.
>>>
>>> I am not an ornithologist.
>>
>> Shouldn't you use the terms that ornithologists use when you're talking
>> about birds?
>
> No, since I'm not an ornithologist, nor am I posing as one.
>
>>>>> What are Bali ducks?
>>>>>
>>>>> The Bali duck is an ancient breed of considerable significance. Ducks
>>>>> of upright carriage have been found carved in the stone of the
>>>>> temples of Asia dating back some two thousand years. Most waterfowl
>>>>> authorities believe the Bali duck to be the originator of the Indian
>>>>> Runner. Google it?
>>>
>>>> It's a breed of mallard.
>>>
>>> Yes, an orthograde Mallard breed.
>>>
>>> What possible significance could it have here?
>>>
>>> It displays an orthograde posture.
>>
>> So?
>
> The thread refers to vegetarian orthograde birds & hominins.
>
>>
>>>>> What angle of synsacrum to
>>>>>> ground marks the line between pronograde and orthograde?
>>>>>
>>>>> Why is that significant? Sheer obviousness should suffice: nearly vertical vs nearly horizontal. Birds aren't built to engineering specs.
>>>>
>>>> It's not a clear dichotomy. It's a continuum.
>>>
>>> Right, that's nature for you.
>>
>> So where do you divide that continuum?
>
> I don't. "Nearly vertical" suffices for human readers, though computer readers may trip on such minor impediments.
>
You're high, how else can you come to believe that John is really a bot
in disguise?
>>
>>>>> I know of no
>>>>>> birds other than penguins that generally adopt a completely vertical
>>>>>> position, though bitterns will do so when hiding.
>>>>>
>>>>> Where do you come up with 'completely vertical'? Oh, your imagination.
>>>>
>>>> I have nothing to work with here, since you refuse to take a position.
>>>
>>> There are two positions mentioned, orthograde-upright-nearly vertical and pronograde-prone-nearly horizontal.
>>>
>>> You sound like a politician.
>>
>> Hey, you're the one who refuses to take a position.
>
> I'm not a wading bird nor a sitting duck.
>
>>>>>>>>>>>>>>> Anhimids are most similar to presbyornithids, with which they form a
>>>>>>>>>>>>>>> clade to the exclusion of the rest of Anseriformes. Given the
>>>>>>>>>>>>>>> presence of lamelae in the otherwise fowl-like beaks of screamers, it
>>>>>>>>>>>>>>> is even possible that they evolved from presbyornithid-grade birds,
>>>>>>>>>>>>>>> reverting from a filter-feeding lifestyle to an herbivorous one.[5]
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> You understand that most ducks are largely if not entirely herbivorous,
>>>>>>>>>>>>>> right? And much of their filtering is of plant material.
>>>>>>>>>>>>>
>>>>>>>>>>>>> And ducks are not orthoganol upright wading birds.
>>>>>>>>>>>>
>>>>>>>>>>>> Sorry, I didn't understand the importance of "orthoganol" to your thesis.
>>>>>>>>>>>
>>>>>>>>>>> Oh my, a taipo.
>>>>>>>>>>
>>>>>>>>>> I don't understand the importance of "orthogonal" either.
>>>>>>>>>
>>>>>>>>> See above.
>>>>>>>>
>>>>>>>> Never explained.
>>>>>>>
>>>>>>> Orthogonal to earth, orthograde to posture.
>>>>>>
>>>>>> I mean that the importance of this feature is never explained in what
>>>>>> you have said.
>>>>>
>>>>> Posture is everything, at least in charm school. I was comparing
>>>>> upright long-legged prometheus vegetarian and long-legged wading-bird
>>>>> non-vegetarian, and gliding vegetarian and non-gliding
>>>>> non-vegetarian.
>>>
>>>> prometheus?? What??
>>>
>>> Referred to earlier.
>>
>> Where? When? How?
>
> Start at top post.
>
>>>> Anyway, what is the importance of the orthograde posture?
>>>
>>> Height.
>>
>> What is the importance of height?
>
> Distance from Earth.
>
>>>>>>>>>>>>>>> Distribution and habitat
>>>>>>>>>>>>>>> Behaviour and ecology Edit
>>>>>>>>>>>>>>> Screamers lay between 2 and 7 white eggs, with four or five being
>>>>>>>>>>>>>>> typical. The young, like those of most Anseriformes, can run as soon
>>>>>>>>>>>>>>> as they are hatched. The chicks are usually raised in or near water
>>>>>>>>>>>>>>> as they can swim better than they can run. This helps them to avoid
>>>>>>>>>>>>>>> predators. Like ducks, screamer chicks imprint early in life. This,
>>>>>>>>>>>>>>> coupled with their unfussy diet, makes them amenable to
>>>>>>>>>>>>>>> domestication..
>>>>>>>>>>>>>> What is the relevance?
>>>>>>>>>>>>>
>>>>>>>>>>>>> Neither Presby. nor screamers would be classed as upright orthogonal wading birds.
>>>>>>>>>>>>
>>>>>>>>>>>> So why go into their ecology? Filling space?
>>>>>>>>>>>
>>>>>>>>>>> Because you asked "What about presbyornis?"
>>>>>>>>>>
>>>>>>>>>> I didn't ask about screamers, or how many eggs anyone lays, or anything
>>>>>>>>>> about what you just cut and pasted.
>>>>>>>>>
>>>>>>>>> Better to know more than less, no?
>>>>>>>>
>>>>>>>> Not if it's irrelevant to what we're discussing.
>>>>>>>
>>>>>>> Screamers are descendants and/or closest analogs to presbyornis,
>>>>>>
>>>>>> No, they are neither. Wherever did you get that idea?
>>>>>
>>>>> Wikipedia IIRC.
>>>>
>>>> Perhaps you don't recall correctly. Or if you do, then Wikipedia is just
>>>> wrong.
>>>>
>>>>>>> hardly irrelevant, as "they swim better than they run". Egrets &
>>>>>>> herons nest high in tree rookeries, I'd guess presbyornis didn't.
>>>>>> How is that relevant, even if true?
>>>>>
>>>>> Arboreal nests and fully webbed feet usually don't jive. (Exc. Wood duck)
>>>>
>>>> I think you mean "gibe". And there are many other exceptions, even
>>>> within ducks.
>>>
>>> Jive/Jambo/jam etc. ~ match
>>>
>>> The majority of fully webbed waterfowl do not fly up to their nests.
>>>
>>>>>>> Should I launch into a
>>>>>>>> disquisition on the diversity of antbirds?
>>>>>>>
>>>>>>> If they have an orthograde posture, and are vegetarian, certainly.
>>>>>>
>>>>>> Well, antpittas do have a pretty erect posture, but I don't know what
>>>>>> counts as orthograde. Come to think of it, so do actual pittas. Both are
>>>>>> insectivores. Perhaps they're counterexamples of your claim, whatever it is.
>>>>>
>>>>> My claim is solid, you can see that.
>>>>
>>>> I can't see that.
>>>
>>> You would not admit seeing it.
>>>
>>> Of course it isn't quite clear what your claim is.
>>>
>>> Perhaps it is beyond your ken.
>>
>> I'm afraid you are living in your own private world.
>
> Why are you afraid? It's Christmas!
>
>
>>>>>>>>>>>>>>>>> Proto-bats gliding into swarms of flying insects to eat them and this
>>>>>>>>>>>>>>>>> habit developed into true flight in bats ... never existed... Gliders
>>>>>>>>>>>>>>>>> are *all* vegetarians... so the [PN@SBP] claim that bats (or birds or
>>>>>>>>>>>>>>>>> Pterosaurs) must have gained flapping flight via gliding ancestors is
>>>>>>>>>>>>>>>>> not based upon common traits but upon imagination.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> What about gliding snakes and frogs? What about sugar gliders and
>>>>>>>>>>>>>>>> possums? What about flying fish? I think your claim is wrong.