Mysterious but clever facility on Macbook rotating photos for display.

I have a question that has puzzled me for days and I can't find out how or why the Macbook does this.
I took a photo on my digi camera in "Portrait" orientation or mode in other words I turned the camera sideways on to take a photo of a tall building. When I transferred the jpg from camera card to Macbook desktop the photo thumbnail on the desktop was mysteriously rotated by stealth purely for viewing as a thumbnail on the screen. More confusion followed! When I transfer the same photo to my PC (sorry to use a two letter word!) the photo on the desktop is still in "landscape" mode and opening it in any PC software displays it in landscape sideways on so I have to rotate it and save it in new orientation.
I tried opening the picture on the Macbook using Preview and it appears there, turned into correct orientation (Portrait) but the picture hasn't been rotated by me. Also when I attach the said photo to an email it dumps the picture on its side (un-rotated) so is impossible to view properly by the recipient of the mail unless they rotate the picture in software external to their email client. Or perhaps turn their monitor on its side, or get a crick in their neck
On the Macbook opening the picture using a web-browser it appears the way it is in reality ie on its side and needs turning through 90 deg. But Preview and iPhoto both turn it the right way up for viewing. So the picture is artificially "righted" by desktop thumbnail view; by iPhoto viewing; by Preview viewing, but left in its original orientation for email and webpage viewing.
How does the Macbook know that this is a photo that has arrived on its side and needs rotating to view it, but then leaves the actual physical rotation to us for doing in an external program?
This secret facility did slightly wrong-foot me as I forgot to rotate the picture and added it to an email both by Insert facility and Attach facility and in both instances the photo sat in the email on its side.
My bible "Switching to the mac Leopard Edition" says nothing about this trick of Macs to display unrotated photos in correct view. Can anyone please throw any light on this concept for me?
Thanks in advance
Plado

Well the plot thickens a bit here. I managed to get a photo with rotational information built-in, to appear in Thunderbird email the right way up by Rotating Anti Clockwise 3 times. Then when I added the picture to email it ended up the right way up.
So the next day I tried another experiment and I switched off the AUTO-ROTATE setting in the Canon Camera and took a picture in Portrait orientation (turning the camera on its side as usual) I then took an identical photo with Auto-Rotate switched back on. I imported both pictures to the Macbook. I saw that the auto rotate "on" setting picture appeared on my macbook desktop rotated the right way for viewing. The one with auto-rotate switched off appeared on desktop on its side.
Now I went to add both pictures to Thunderbird email by Insert as usual and for some inexplicable reason the odd behaviour decided to cure itself and the auto-rotate photo appeared in the email the right way up instead of on its side, and the auto-rotate switched off photo appeared in the email on its side.
I sent the email to someone who verified that picture one was the right way up, and picture 2 was on its side. So this sounds to me like it's a stupid phenomenon of Thunderbird mail as installed on a mac. There can be no other reason why it behaves one way yesterday and the opposite effect the next day.
So I think my problem is solved now. But I bet the peculiar behaviour returns as this afternoon Thunderbird stopped displaying any cursor when clicking in the text of what I was writing. Something weird going on with that. Exasperating!
Plado

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