LEGO compatibility with Duplo, Quatro, and even bigger LEGO bricks - YouTube
Lego and Duplo Compatible? - YouTube
Mind blown. 30 years with Lego and I just realized duplo are compatible. : r/lego
Doblo factory - EduTech Wiki
Lego Duplo Blocks & Mega Bloks compatible lot of 180+ pcs batmobile parts doors | eBay
Amazon.com: 4-Pack Multi Vehicles Transportation Set - Big Building Blocks Compatible with Lego Duplo - Police Car, Fire Truck, School Bus, Motorcycle Accessories Kids Early Education Toys : Toys & Games