If you log into Roblox: Grow A Garden after the event is already live, you won't receive the Chicken Zombie. As such, the only way to currently get this pet is by trading.

Astronauts Have Already Been in Space for Over 6 Months. Now Their Return Has Been Delayed Again, NASA Says Billionaire Bill Ackman Has 45% of His Hedge Fund's $13.4 Billion Portfolio Invested in ...