It's customary for the little ones to leave their fallen milk teeth out on the bedside. Under the pillow? Oh goodness no, you'd not want them startled awake by little hands scrabbling beneath the pillowcase. Or worse! No grown being wants to wake to that overfilled grin hovering over them with tiny talons prising apart their lips, let alone a young'un... Instinct: to collect teeth for the nest

• Nip, then fly away
• Flit distractingly about their heads
• Scatter when things get rough