 When threatened, it often curls into a circle with its tail covering its head, in a similar fashion to the shysharks ("Haploblepharus").Its eggs are fed upon by the whelks "Burnupena papyracea" and "B. lagenaria", which can pierce the outer covering to extract the yolk within.Like other sharks, the pyjama shark maintains osmotic balance with the environment by regulating its internal concentration of urea and other nitrogenous wastes.