Sesame Street Mecha Builders Episode 15 The Pinecone Palooza / Big Footed Cave Bird Episode Title: The Pinecone Palooza / Big Footed Cave Bird Episode Description: Grandma and Timmy are entering the Pinecone Art Show by carving a sculpture out of stone… that is, if they can learn how to carve. The Mechas learn how to use old-fashioned tools to help Grandma and Timmy carve their sculpture. Ranger Nat is hiking and comes across the Big-Footed Cave Bird, and realizes it can't get back into her home. The Mechas find out that the bird's door keeps closing, and need to find something to keep the door in place.