TzRek-Zuk is a pet who is a much smaller version of TzKal-Zuk, the boss of the Inferno. It can only be obtained by receiving Jal-Nib-Rek, where players can then right-click "Metamorphosis" to change between the Jal-Nib and TzRek-Zuk.
On death, if a player loses their pet (as a follower or in your inventory) it will wander around for 30 seconds before disappearing completely.
Players can pay a one-time fee of 500,000 coins to Probita in East Ardougne to have this pet insured. Should the pet be lost while insured, it can be reclaimed for 1,000,000 coins.