Penguins hand over pebbles; scorpionflies give spitballs. But I’m hankering after a sea sponge presented by a dolphinThis Christmas morning, are you worried you didn’t choose quite the right gift for that someone special? I always try my hardest, but everywhere I turn I’m bombarded with unhelpful suggestions. No, I don’t want a candle that smells like turkey, because, well, we’ll be cooking turkey. Nor do I want a sunrise alarm clock that mimics natural light, because I can leave the curtains open. And I definitely don’t want a salmon DNA pink collagen jelly mask (Good Housekeeping’s Best for Beauty Lovers), because said DNA comes from milt. AKA semen. If I wanted fish sperm on my face, I would tickle some pollocks.So if, like me, you’re always looking for inspiration, my advice is: learn from the animal kingdom. Humans didn’t invent gifting. The practice has been around for at least 100m years, long before our species evolved. With a little help from natural selection, this has giv...