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The second question is How many purple starfish are there on Ginger Island? The correct answer is 18 purple starfish.
At the moment, we don't have any clear fossils of the ancestors of bats,' Neil says. 'Some research suggests that bat characteristics, like the elongation of digits and arms, could be caused by only a few genetic changes.' Springer, M. S.; Teeling, E. C.; Madsen, O.; Stanhope, M. J.; De Jong, W. W. (2001). "Integrated fossil and molecular data reconstruct bat echolocation". Proceedings of the National Academy of Sciences. 98 (11): 6241–6246. Bibcode: 2001PNAS...98.6241S. doi: 10.1073/pnas.111551998. PMC 33452. PMID 11353869.The Fossil Lake deposits of the Green River Formation are simply amazing because the conditions that created the paper-thin limestone layers also preserved nearly everything that settled to the lake's bottom," said Arvid Aase, park manager and curator at the Fossil Butte National Monument, in Wyoming. "One of these bat specimens was found lower in the section than all other bats, making this species older than any of the other bat species recovered from this deposit." Bishop, K. L. (2008). "The Evolution of Flight in Bats: Narrowing the Field of Plausible Hypotheses". The Quarterly Review of Biology. 83 (2): 153–169. doi: 10.1086/587825. PMID 18605533. S2CID 21638734. The scientists also detected a sister relationship with the only other recorded species of Icaronycteris in North America, I. index, which means that they are each other's closest known relatives.
Below is a table chart following the bat classification of families recognized by various authors of the ninth volume of Handbook of the Mammals of the World published in 2019:  Chiroptera Blumenbach, 1779The Weird Sisters in Shakespeare's Macbeth used the fur of a bat in their brew.  In Western culture, the bat is often a symbol of the night and its foreboding nature. The bat is a primary animal associated with fictional characters of the night, both villainous vampires, such as Count Dracula and before him Varney the Vampire,  and heroes, such as the DC Comics character Batman.  Kenneth Oppel's Silverwing novels narrate the adventures of a young bat,  based on the silver-haired bat of North America. 
Scientists believe that advantages such as flight and echolocation would have helped bats spread and diversify rapidly. The mammals may have adapted to nocturnal lives to avoid competition with or predation by birds—but when this transition occurred is unclear. Jürgens, Klaus Dieter; Bartels, Heinz; Bartels, Rut (1981). "Blood oxygen transport and organ weights of small bats and small non-flying mammals". Respiration Physiology. 45 (3): 243–260. doi: 10.1016/0034-5687(81)90009-8. PMID 7330485.
Rietbergen first saw one of the skeletons of Icaronycteris gunnelliin 2017 when he was scrolling through Facebook. “I was like, hmm, this looks a little bit different,” he says.