Far from home, in a steamy rainforest clearing, a long day of collecting is almost over. Pixel Charles Darwin has filled his notebook with drawings of beetles, tree frogs, orchids and finches, and now the field cards must be paired up before the light goes. The puzzle that keeps him busy past dusk is the one he calls Lookalike Beetles.
The forest likes to play tricks. The same beetle can turn up on a parchment card and on a blue card, and two colour forms are not the same find, so only the same picture on the same colour makes a pair. Every pair goes into the collecting box, and each sorted batch brings a bigger one. When the clock runs out, night falls on the clearing. How many batches can pixel Darwin sort?
