Big the Cat has four lures hidden in the game, and you need all of them to get all his Emblems. They are:

1 - In the sewer of Station Square.
2 - Hidden in the Icecap level.
3 - Aboard the Egg Carrier.
4 - Hidden in the jungle by Bigs House. From his place, take the second path on the left. Follow it to the fork and go to the right. Once past the first river youll find it.