This month, animal arithmetic from a research group in Italy who investigated how chickens order numbers – I put Naked Scientist Graihagh Jackson through her paces. Also in the episode, Leanne Grieves from McMaster University tells me what Smooth-billed anis do in response to different types of predators. And Niels Dingemanse, from the Max Planck Institute for Ornithology tells me about his Scientific Spark.