BIRDS - BLACK-THROATED LOON
One more time, though not much more to say, but I love all those Swedish animal stamps and I love recess-printed stamps and I love bird stamps and I think this is such a lovely example, and on it you can see that this loon has a very prominent chest at waterline. The red-throated loon on the other hand (yet to appear on a stamp) has quite a flat chest which is a good way to tell the two apart.
Oh yes, and if you like frogs, go and read Eric's blog (My Philately link). And if you don't like frogs, go and read it just the same for it's not just frogs there!