According to Muppet Wiki, “Murray is a Sesame Street  monster who hosts two regular segments, ‘The Word of the Day’ and ’Murray Has a Little Lamb.’ The energetic monster was first seen in his early talk spots with the kids in Season 36 (2005), often discussing the importance of exercise and healthy habits with young visitors.  Although unnamed, the character was referred to on the set as "FilFil," as his design is based on that of Filfil from Alam Simsim. Beginning in Season 38 (2007), he gained an identity as Murray, hosting the ‘What's the Word on the Street?’ segments that precede each episode of Sesame Street. In Season 39 (2008), he began appearing in his own segment, ‘Murray Has a Little Lamb’, where he goes to a certain school with his pet lamb, Ovejita. In Season 40 (2009-2010), he started serving as a host of the new "block format", presenting the letter and number of the day, introducing upcoming sketches within the episodes, and announcing the sponsors. Murray was given a new segment in Season 42 (2011-2012), ‘Murray's Science Experiments’, which are spread through the tune-ins. He is again with Ovejita.”