I’ve sent these:
Not sure if the last two count… they are lenticular cards!
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What a lovely thread, thanks for starting it! 
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What a fun idea - here are some of the bird cards I’ve sent:
and here are some bird cards I have received:
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A beautiful card I received from India!
These birds are lovely, received a while back.
I do love this owl I received; by artist Albrecht Dürer.
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Lovely topic, thank you @Florallle!!
Here are a couple of my recently sent bird postcards:
• Purple-crowned Fairy-wren
• Red-backed Fairy-wren
• Zebra finch
• Eastern curlew
• and an illustrated Rainbow lorikeet
I have many more I think. We have some pretty amazing birds here. 
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And a few more pretties, because I’m on a roll…
• Red-browed pardalote
• Sacred kingfisher
• Budgerigar
• Emu
• Adélie penguin
• Australian brush-turkey
• Tawny frogmouth
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There was a lady (I believe from Denmark) who belonged to one of those Yahoo groups years ago. She had a pretty impressive collection of Birds on postcards as I recall.
About a year ago, I ran a lottery offering the postcards featuring Birds:
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Thanks everyone for your amazing replies. So many wonderful birds already.
These are some of the first birds I received on postcards when I joined postcrossing:
And one that I sent, Great tit, Parus major
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I know Tawny Frogmouths are masters of disguise, but I really really had to look to spot this one!
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Haha @Florallle I know what you mean! Postcards of old branches are not my favourite type of postcard!! 
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A few of mine:
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Some more. These are from my early days in postcrossing and I didn’t always find out the names 
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And I think this about wraps up all of my ‘sent’ birds:
- Kookaburra (Illustrated - You Little Ripper)
- Sulphur-crested cockatoo (Illustrated - You Little Beauty)
- Superb fairy-wren (Illustrated - Have a Superb Day)
- Superb fairy-wren (Illustrated)
- More Budgerigars
- Spotted pardalote (Watercolour painting by a family friend, of a bird in my garden)
- Emperor penguin
- Barn owl (Illustrated card from The Wild Cards boxset)
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A new one today!
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I am sad I can’t find this card in shops anymore :
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I’m not sure what these are. Top middle might be a linnet, and below that a goldcrest maybe. Does anyone know?
And some I sent, starting with a kingfisher:
And a barn owl:
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And here are a few of my favourite received ones 
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Some more I’ve received:
I’m guessing this is a fieldfare, though I’ve never seen the breast as red as this:
And a few more that I sent:
Yellow wagtails, Motacilla flava
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