Incredible that they have the same general hardware as any other mammal, compare a shrew to a blue whale, potentially 50,000,000X heavier - they both have one heart, two eyes, hearing, smell, lungs, sex organs, kidneys, brain, spine, etc.

It's fascinating.

The bee hummingbird weights 2 grams and it's 6cm long (about 2 inches) including the tail.

I always thought my budgerigar weighed nothing at 30grams (about an ounce), but he's not even close.

Try the etruscan shrew, they weigh about two grams.

Yes, abundant on Socotra island. I recently explored Socotra on Google Earth and and was surprised I had never heared about this isolated, prestine Island. One of its caves is a treasure trove of writings/drawings by travellers from various parts of the world over the centuries.