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b'Thanks to Tobey and Janice this week for their suggestions of lesser-known sharks!\\n\\nFurther reading/watching:\\n\\nCREATURE FEATURE: The Spinner Shark [this site has a great video of spinner sharks spinning up out of the water!]\\n\\nAcanthorhachis, a new genus of shark from the Carboniferous (Westfalian) of Yorkshire, England\\n\\n150 Year Old Fossil Mystery Solved [note: it is not actually solved]\\n\\nThe cartoon-eyed spurdog shark:\\n\\n\\n\\nThe spinner shark spinning out of the water:\\n\\n\\n\\nThe spinner shark not spinning (photo by Andy Murch):\\n\\n\\n\\nA Listracanthus spine:\\n\\n\\n\\nShow transcript:\\nWelcome to Strange Animals Podcast. I\\u2019m your host, Kate Shaw.\\nThis week we\\u2019re going to learn about three sharks you may have never heard of before! The first was suggested by my aunt Janice and the second by listener Tobey. The third is a mystery from the fossil record.\\nYou may have heard about the findings of a study published in November of 2021, with headlines like \\u201cVenomous sharks invade the Thames!\\u201d My aunt Janice sent me a link to an article like this. Nobody is invading anything, though. The sharks belong where they are. It was their absence for decades that was a problem, and the study discovered that they\\u2019re back.\\nThe Thames is a big river in southern England that empties into the North Sea near London. Because it flows through such a huge city, it\\u2019s pretty badly polluted despite attempts in the last few decades to clean it up. It was so polluted by the 1950s, in fact, that it was declared biologically dead. But after a lot of effort by conservationists, fish and other animals have moved back into the river and lots of birds now visit it too. It also doesn\\u2019t smell as bad as it used to. One of the fish now found again in the Thames is a small shark called the spurdog, or spiny dogfish.\\nThe spurdog lives in many parts of the world, mostly in shallow water just off the coast, although it\\u2019s been found in deep water too. A big female can grow almost three feet long, or 85 cm, while males are smaller. It\\u2019s a bottom dweller that eats whatever animals it finds on the sea floor, including crabs, sea cucumbers, and shrimp, and it will also eat jellyfish, squid, and fish when it can catch them. It\\u2019s even been known to hunt in packs.\\nIt\\u2019s gray-brown in color with little white spots, and it has large eyes that kind of look like the eyes of a cartoon shark. It also has a spine in front of each of its two dorsal fins, which can inject venom into potential predators. The venom isn\\u2019t deadly to humans but would definitely hurt, so please don\\u2019t try to pet a spurdog shark. If the shark feels threatened, it curls its body around into a sort of shark donut shape, which allows it to jab its spines into whatever is trying to grab it.\\nThe spurdog used to be really common, and was an important food for many people. But so many of them were and are caught to be ground into fertilizer or used in pet food that they\\u2019re now considered vulnerable worldwide and critically endangered around Europe, where their numbers have dropped by 95% in the last few decades. It\\u2019s now a protected species in many areas.\\nThe female spurdog retains her fertilized eggs in her body like a lot of sharks do. The eggs hatch inside her and the babies develop further before she gives birth to them and they swim off on their own. It takes up to two years before a pup is ready to be born, and females don\\u2019t reach maturity until they\\u2019re around 16 years old, so it\\u2019s going to take a long time for the species to bounce back from nearly being wiped out. Fortunately, the spurdog can live almost 70 years and possibly longer, if it\\u2019s not killed and ground up to fertilize someone\\u2019s lawn. The sharks like to give birth in shallow water around the mouths of rivers, where the water is well oxygenated and there\\u2019s lots of small food for their babies to eat, which is why they\\u2019ve moved back into the Thames.\\nNext, Tobey suggested we talk about the spinner shark.'