Describes the research that Samuel Marshall and his students are doing on tarantulas, including the largest spider on earth, the Goliath birdeating tarantula. Interest Level: 3-6 Reading Level: 5.8 ATOS Book Level: 5.8 AR Interest Level: MG AR Points: 2 AR Quiz: 77552EN Reading Counts Level: 5.6 Reading Counts Points: 6 Lexile Measure: 890 Fountas & Pinnell: W Every Child Reads.