Best strategy from what I’ve found

1 first scout the swamp with a spyglass from the back of an argy. This will allow you to see the gender without getting too close.

2) If the bug is a male, kill it and harvest pheromones. If female make a note of location for later. For killing the male use beelzebufo or Megatherium.

3) feed pheromones to a tame with high drag weight. My personal recommendation is Paraceratherium as they are very common and fairly easy to replace. Also the platform saddle plus mini gun turret makes it simple to get a female to ten health

4) track down female and get it to 10% health. If you find yourself with multiple pheromones and multiple sacrifices you can get multiple tames implanted with eggs in one fell swoop.

5) meet creatures very bizarre food demands until baby makes its big entrance and ta da. You now have a giant incectoid assault chopper.