Doesn't matter which kind of beetle nor lizard types. The following are what I killed for the updates:
stone beetle x/9
a monitor behemoth and/or a monitor lizard x/10
After kill the above, next update is a little more specific kill task:
At dog lake:
carrion hound pups didn't get an update
a carrion hounds x/6
Rode the Griffon to Nek. Station
Tower of Zarvonn: Walked around to the back of the tower for the update
then back to South Freeport to speak with Lavic for the next quest line.