The Egg Burst is a Badnik featured in Sonic Unleashed.
Found only in daytime stages, they are similar to the Egg Shackles in terms of appearance, but are colored red and black. If Sonic makes contact with them, they will latch onto him and self-destruct after a short while, causing damage in the process. To shake them off, the player must repeatedly Stomp or use the Foot Sweep.
In the Wii/PS2 version, these Badniks function as bombs that will rain down on the path from above and explode upon reaching the ground. Their blast radius isn't very large, though.
||The innocent grins on these baddies belie a twisted personality that would allow them to self-destruct without batting an eye in order to take Sonic with them.
— Encyclopedia, 360/PS3 version