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 Dinosaurs With Feathers

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NoCoPilot

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PostSubject: Dinosaurs With Feathers   Dinosaurs With Feathers EmptyTue Feb 13, 2018 8:35 pm

It is now generally accepted I think that many/most dinosaurs had feathers or feather-like fur, if not for flight then for warmth and sexual signaling.  What did they look like?  Interesting to consider.
Dinosaurs With Feathers 22_lefthead
Dinosaurs With Feathers Was-the-T-rex-ginger
Dinosaurs With Feathers T-REX-FEATHERS
Dinosaurs With Feathers Cats
Dinosaurs With Feathers Feather3

Probably not dull brown, probably more flamboyant wouldn't you think?


Last edited by NoCoPilot on Sat Jul 10, 2021 2:35 pm; edited 2 times in total
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NoCoPilot

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PostSubject: Re: Dinosaurs With Feathers   Dinosaurs With Feathers EmptyWed Jun 09, 2021 10:55 am

Birds have a cloaca, and excrete their solid and liquid wastes together in a wet paste.

Nobody knows if dinosaurs, from whom birds descended, used a similar excretory technique.  Although it's assumed they did:
https://www.newscientist.com/article/2258023-dinosaur-fossil-with-preserved-genital-orifice-hints-how-they-mated/
Quote :
We all know about many of the features of birds that allow them to master the air: hollow bones, light yet strong feathers for producing lift and thrust, and streamlined bodies.  However, other adaptations for flight are subtler and perhaps unexpected.  The various organ systems for birds all contribute to make a bird a consummate flying machine.

Let’s start with the urinary or excretory system. The function of any excretory system is to rid the body of nitrogen-containing wastes from the breakdown of proteins.  The most common waste product is ammonia, a toxic material.

For fish and invertebrates that live in freshwater or the sea, it’s pretty easy to get rid of the ammonia by producing a large quantity of dilute urine.  Water is not a problem for an aquatic organism.

Humans and other mammals can’t use this same mechanism.  We would have to essentially spend our lives drinking water and urinating to flush the toxic ammonia from our bodies.

To solve this problem, we convert ammonia to a substance called urea.  Urea is toxic only in very high concentrations and can be dissolved in water.  So, the problem is solved for mammals.  By converting ammonia to urea, our kidneys can concentrate the urea and get rid of it with a moderate amount of water.

This method of removal of nitrogen waste does not work for birds.  Many of the avian adaptations for flight involve making the body as light as possible.  If birds produced urea, they would have to carry around an unacceptably heavy load of water to flush the urea from their body.

Instead, birds convert their ammonia wastes to a compound called uric acid.  It takes more energy to convert ammonia to uric acid than to urea.  However, the cost is worth it for birds because uric acid is non-toxic and also does not dissolve in water.

Birds therefore get rid of their nitrogen waste by using only enough water to push the paste-like uric acid down the excretory system.  The white center in bird guano is uric acid.

Last weekend Jurassic Park I, II and III were on TV.  The digital dinosaurs were fabulously done... but WAY too drab.  I'm sure sexual selection, as in birds, would have resulted in wild variations.
Dinosaurs With Feathers Ht_dinosaurs_3_er_160603_16x9_992
Dinosaurs With Feathers 151006-dinov4 <===Note: These are Barney colors
Dinosaurs With Feathers Dino_dps_03-7b541f7


Last edited by NoCoPilot on Sat Jul 10, 2021 2:38 pm; edited 3 times in total
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richard09

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PostSubject: Re: Dinosaurs With Feathers   Dinosaurs With Feathers EmptySat Jul 10, 2021 2:20 pm

I haven't seen this explained so clearly before.

How Do We Know Birds Are Dinosaurs?
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NoCoPilot

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PostSubject: Re: Dinosaurs With Feathers   Dinosaurs With Feathers EmptyMon Dec 19, 2022 2:54 pm

Dinosaurs made sounds. Lots of them.

This article is cutting edge, showing colorful dinos. Bravo.
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NoCoPilot

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PostSubject: Re: Dinosaurs With Feathers   Dinosaurs With Feathers EmptyWed Mar 15, 2023 2:28 pm

More on dino sounds. They did not roar, They did not grunt.

They had songs like birds. Probably.
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PostSubject: Re: Dinosaurs With Feathers   Dinosaurs With Feathers Empty

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