Mapping with Antlions

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Antlions
This article explains a good amount of information about Antlions; Antlion behavior includes how they act, how to make them unburrow when walking on the sand, how to make them fly, or how to make them follow a precise route.
Antlions basically can't see; they hear their enemies which is why they are complicated to handle sometimes. In most cases, they just run to you and kill you, but you can make them do precise things too.
Mapping
npc_template_maker
In most cases, a simple npc_maker won't suffice because it's doesn't use the options of the antlion (start burrowed, his alert radius, his path corners, squad names, and hint groups also).
To make it work well, check the Start Burrowed flag on the antlion, configure the npc_template_maker normally with the antlion in the template then go in the outputs and do the following.
OnSpawnNpc Antlion Unburrow
As soon as the burrowed antlion spawns he will unburrow, instead of appearing from nowhere.