Around 1,000 metres below sea level live translucent parasites. Called phronima or pram bugs, these sinister shrimp-like creatures have giant eyes and large claws to capture prey. Here the pram bug appears to be carrying what looks like a plastic bag, but it’s actually grasping onto another species of marine life called a salp. Salps are gelatinous invertebrates that drift through warm waters and filter feed on microscopic plankton. However, for the pram bug they also make good baby carriers. The pram bug will ingest the internal organs of the salp and then use its outer casing to carry its young – the orange clusters – around for protection.