An Australian domestic flight was delayed for two hours after a stowaway snake was found in the plane’s cargo hold, officials said on Wednesday.

The snake was found on Tuesday as passengers were boarding Virgin Australia Flight VA337 at Melbourne Airport bound for Brisbane, according to snake catcher Mark Pelley.

The snake turned out to be a harmless 60-centimeter (2-foot) green tree snake. But Pelly said he thought it could be venomous when he approached it in the darkened hold.