06:15David Attenborough's Natural CuriositiesSeries 1Episode 4: A Curious TwistBBC Two Duration: 25 minutes Sat 12th May 2018, 06:15 on BBC Two HDWhy the spiral is so important to two very different animals.ContributorsPresenter:David AttenboroughDirector:Hilary JeffkinsProducer:Hilary JeffkinsDirector:Sharmila ChoudhuryProducer:Sharmila ChoudhuryExecutive Producer:Stephen DunleavyProduction Company:Humble Bee FilmsGenresFactualScience & NatureNature & EnvironmentFormatsDocumentariesBrandDavid Attenborough's Natural CuriositiesSeriesDavid Attenborough's Natural Curiosities: Series 1 Source: BBC Online