Weird creature feature: Salp. The family that stays together…Salps have a complex life cycle, growing so fast that they can grow to maturity in 48 hours. They are thought to be the fastest growing multicellular animal on Earth, increasing their body length by up to 10% per hour. Salps have a complex life cycle alternating between a sexual and asexual form. Despite looking rather like a jellyfish, salps are a member of the Tunicata, a group of animals also known as sea squirts. They are taxonomic