This is common, the snake detects high concentractions of C02 within the can thinking that a prey item is inside the can he enters and before he knows it he is trapped and suffers a painful slow death.

All Australian Native Fauna & Flora is protected by Law with heavy fines & gaol / jail terms.

NSWFB is often called free trapped animals of all types, this type of rescue is hazardous, more often the Vet will euthanised highly venomous snakes