This is normal, so don't worry! This is actually an Easter time event of your Tamagotchi watching an egg hatch into a baby bird or a baby Tamagotchi. The V2/V3 counterpart of this is an Easter bunny pushing an egg around the screen.
Yeah I've seen this a few times. I didn't see the snake though o_O;;; it was a baby tama in the egg that hatched out of the colourful easter egg. Everytime I see the rabbit push the egg on the screen I can only imagine what my tama's reaction XD!