Arduino controlled Walking Robot using Servo motors - YouTube
Amazon.com: ELEGOO Penguin Bot Biped Robot Kit Compatible with Arduino Project with Assembling Tutorial,STEM Kit for Hobbyists, STEM Toys for Kids and Adults,White Version V2.0 : Toys & Games
Nybble: 4 Legged Walking Robot
Rana: An arduino inspired biological robot - Hackster.io
DIY Arduino based Bluetooth Biped Bob (Walking and Dancing Robot)