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/sci/ - Science & Math

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Ctrl-Z Wed Aug 21 18:41:56 2013 No.5983302 [Reply] [Original]

What are birds?

>>	Anonymous Wed Aug 21 18:43:54 2013 No.5983309 File: 994 KB, 250x250, we just dont know.gif [View same] [iqdb] [saucenao] [google]

>>	Anonymous Wed Aug 21 18:43:54 2013 No.5983308 we just don't know

>>	Anonymous Wed Aug 21 18:45:54 2013 No.5983318 >>5983308 >>5983309 nope, they are dinosaurs

>>	Anonymous Thu Aug 22 11:24:54 2013 No.5984519 >>5983318 That's absurd.

>>	Anonymous Thu Aug 22 11:31:24 2013 No.5984532 tasty

>>	Anonymous Thu Aug 22 11:53:26 2013 No.5984558 chicken

>>	Anonymous Thu Aug 22 11:59:54 2013 No.5984568 what <span class="math">are[/spoiler] birds?

>>	Anonymous Thu Aug 22 12:29:55 2013 No.5984607 File: 19 KB, 550x733, 1376349468647.jpg [View same] [iqdb] [saucenao] [google] >whoami

>>	Anonymous Thu Aug 22 13:25:52 2013 No.5984678 File: 265 KB, 550x733, whoWho.png [View same] [iqdb] [saucenao] [google] >>5984607

>>	Anonymous Thu Aug 22 14:25:11 2013 No.5984747 according to geology 175 they are dinosaurs

>>	Anonymous Thu Aug 22 14:56:06 2013 No.5984810 >>5984519 Yes, but I hear this all the time. Especially from little kids. I think they are taught this at school.

Anonymous Fri Aug 23 10:16:34 2013 No.5986309

>>5984747
>>5984810
Birds are not dinosaurs, you fucking pseudo-intellectual faggots. Birds EVOLVED from dinosaurs. That doesn't mean they are dinosaurs. It's like saying humans are mice because we evolved from apes and apes evolved from mice. Absolutely idiotic.

>>	Anonymous Fri Aug 23 10:21:35 2013 No.5986317 >>5986309 Lungfish are still fish.

>>	Anonymous Fri Aug 23 10:26:04 2013 No.5986323 Aves

>>	Anonymous Sat Aug 24 07:18:38 2013 No.5987975 >>5986317 Birds are not fish.

>>	Anonymous Sat Aug 24 20:03:14 2013 No.5989061 >>5984678 Hardly readable. You should have chosen a better font.

>>	Anonymous Sat Aug 24 20:05:13 2013 No.5989062 >>5987975 axially, that depends on the level of cladistics one is using

>>	Anonymous Sun Aug 25 19:50:48 2013 No.5990830 >>5989062 What level of cladistics are birds?

>>	Anonymous Mon Aug 26 16:54:00 2013 No.5992361 >>5990830 Are they a class or a phylum?

>>	Anonymous Tue Aug 27 17:41:19 2013 No.5993963 >>5992361 Does anybody know?

>>	Anonymous Tue Aug 27 17:43:50 2013 No.5993969 File: 456 KB, 420x315, 1363043001060.gif [View same] [iqdb] [saucenao] [google] >>5993963 Nobody knows

Anonymous Tue Aug 27 17:46:18 2013 No.5993974

they (like us) are descendants of the dinosaurs. Where we evolved from species like the anklyosaur, birds evolved from raptors like jurasic park. Birds have really tiny teeth like the raptors had, but hardly use them since all they eat are bread from people at the pond and shit.

>>	Anonymous Tue Aug 27 18:34:35 2013 No.5994065 >>5986309 humans are mice

>>	Anonymous Tue Aug 27 18:41:49 2013 No.5994073 >>5986309 Actually, saying that birds are dinosaurs is more like saying that primates are mammals, which is absolutely correct. If you disagree, please read up on your basic phylogeny.

>>	mothergoose !!DUwV6rmVW4k Tue Aug 27 18:43:49 2013 No.5994076 >tfw no books on the lepidopterus arboratus

>>	Anonymous Tue Aug 27 19:01:18 2013 No.5994094 >>5994076 >lepidopterus arboratus Can you tell what we're looking for yet?

>>	Anonymous Tue Aug 27 21:39:19 2013 No.5994384 The handy never wrong way of classifying birds: They are a type of theropod dinosaur that has many thousands of different species and extinct types include the velociraptor.

>>	not the Vsauce shill Wed Aug 28 15:03:20 2013 No.5995637 Birds (class Aves or clade Avialae) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals.

>>	Anonymous Thu Aug 29 14:18:21 2013 No.5997384 >>5995637 What is the difference between a clade and a class?

>>	Anonymous Fri Aug 30 09:47:48 2013 No.5998785 >>5997384 Any zoologists here?

>>	Anonymous Fri Aug 30 10:53:04 2013 No.5998852 File: 419 KB, 648x1854, 20130828.png [View same] [iqdb] [saucenao] [google] Birds are dinosaurs. Pic related.

>>	Anonymous Fri Aug 30 11:02:34 2013 No.5998861 birds are dumbshits

>>	Anonymous Fri Aug 30 11:10:04 2013 No.5998873 Why are birds?

>>	Anonymous Fri Aug 30 18:18:24 2013 No.5999786 >>5983309 Jesus christ I loved these videos.

>>	Anonymous Fri Aug 30 18:21:25 2013 No.5999798 >>5998861 >implying inb4 "huurrrr durr ur a bird faget"

>>	Anonymous Fri Aug 30 18:32:23 2013 No.5999822 just birds

>>	Anonymous Sat Aug 31 13:08:24 2013 No.6001349 >>5998852 Source on the comic?

>>	Anonymous Sat Aug 31 13:15:25 2013 No.6001364 >>6001349 smbc-comics.com

>>	Anonymous Sun Sep 1 09:11:34 2013 No.6002991 >>6001364 thank you

Anonymous Sun Sep 1 09:51:05 2013 No.6003017

>>5997384

A clade is a group of animals which all share a common ancestor, it's a natural group and can be a class if it's at that taxonomical level. A class is a taxonomical level that's under phylum and above order, it can be a clade if it's a natural taxon (one that's phylogenetically correct in its structure) or it can be an artificial taxa if it's members don't share a common ancestor.

Cladistically birds, clade Aviales, are members of Paraves, which groups raptors and all bird-like dinosaurs, which in itself is part of Sauropsida which groups all reptiles and birds and all non-synapsid amniotes.

Taxonomically Aves is an artificial taxa (because it excludes the common ancestor of birds which was a reptile) which is a class in the phylum Chordata, and part of the superclass Tetrapoda.

Anonymous Sun Sep 1 09:57:34 2013 No.6003021

>>6003017

Correcting myself, a clade is a group of organisms, not necessarily animals.

>>5993974

As much as I'd love to say I'm descended from a dinosaur, mammals descended from the therapsids (clade Synapsida) which descended from pelycosaurs. Pelycosaurs branched from other amniotes very early, before the appearence of what you might call dinosaurs (clade Dinosauriformes)

>>	Anonymous Sun Sep 1 10:19:05 2013 No.6003042 >>5994073 huh? wouldn';t that be more like saying birds are reptiles? Dinosaurs are like reptiles right?

Anonymous Sun Sep 1 11:51:04 2013 No.6003153

>>6003017
>Taxonomically Aves is an artificial taxa (because it excludes the common ancestor of birds which was a reptile) which is a class in the phylum Chordata, and part of the superclass Tetrapoda.
Aves has like shitton of definitions. More concrete-defined groups are Paraves, Avialae, Neornithes etc. Neornithes, for instance, is a crown-based taxon, containing all modern birds.
And since when birds polyphiletic? They all share a common ancestor, which is also a bird.

Anonymous Sun Sep 1 12:00:34 2013 No.6003168

>>6003042
"Reptilia" is an artificial group, or "evolutionary grade", that explicitly excludes birds and mammals.
Sometimes though "Reptilia" is defined as a synonym of Sauropsida, or as a subclade of Sauropsida containing all modern reptiles. By these definitions yes, birds are reptiles.

Anonymous Sun Sep 1 12:20:35 2013 No.6003187

>>6003153

Birds aren't polyphiletic but as far as I know the latest common ancestor isn't included in Aves so it can't be defined as a "natural" taxa, and like you said Aves has a shitton of definitions and can't really be called a "clade", some of the other groupings you named are more phylogenetically correct.

>>	Anonymous Sun Sep 1 22:50:47 2013 No.6004159 >>6003017 Thank you.

>>	Anonymous Mon Sep 2 19:19:11 2013 No.6005541 Birds are animals that can fly.

>>	Anonymous Mon Sep 2 19:23:12 2013 No.6005549 >>6005541 What are lungfish?

>>	Anonymous Tue Sep 3 13:59:41 2013 No.6006663 >>6005549 Lungfish are fish and not animals.

>>	Carbon Wed Sep 4 01:33:34 2013 No.6007706 >>5983302 organisms that show signs of intelligence and can fly

>>	Anonymous Wed Sep 4 13:51:21 2013 No.6008443 >>6007706 >signs of intelligence How would you design an IQ test for birds?

>>	Anonymous Thu Sep 5 13:20:40 2013 No.6010138 >>6008443 Let them take an IQ test for humans.

>>	Anonymous Fri Sep 6 09:33:14 2013 No.6011952 Birds are all animals that are neither mammals nor reptiles.

Anonymous Fri Sep 6 09:43:41 2013 No.6011963

>>6008443
Considering human children don't understand delayed gratification[1] but some birds do[2], I would say they are somewhat "intelligent".

[1] http://harbaugh.uoregon.edu/Readings/UGBE/Mischel%201989%20Science,%20Delay%20of%20Gratification.pdf
[2] http://onlinelibrary.wiley.com/doi/10.1901/jeab.1974.21-485/abstract

>>	Anonymous Fri Sep 6 10:09:40 2013 No.6011986 >>6010138 Hah, and if they don't take it, then they are dumb.

>>	Anonymous Fri Sep 6 11:08:42 2013 No.6012017 where did this joke even come from?

>>	Anonymous Fri Sep 6 19:58:10 2013 No.6012754 >>6012017 http://www.youtube.com/watch?v=wfvEgWINUFc

>>	Anonymous Sat Sep 7 10:43:50 2013 No.6013576 >>6012754 thanks

>>	Anonymous Sun Sep 8 09:32:31 2013 No.6015722 Most birds are not mammals.

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