Most outlaws hit you direct. The botfly doesn't.
The botfly stages a heist.
Here's the play. The female human botfly, *Dermatobia hominis*, lives in the lowland rainforests of Central and South America. She has eggs. She needs to put them somewhere warm — somewhere with a heartbeat. She herself cannot bite a human. She has no functional biting mouthparts. She's a heavy-bodied, sluggish, iridescent fly that couldn't hurt you in a saloon brawl if she tried.
So she catches a mosquito.
This is the part most people don't believe. The botfly intercepts a blood-feeding mosquito mid-flight, holds her, and *glues* fifteen to thirty eggs to the underside of the mosquito's abdomen. The mosquito doesn't enjoy any of it but eventually gets free. Now the mosquito is a courier. The mosquito doesn't know.
The mosquito does what mosquitoes do — finds a host, lands, drinks. The host's body heat triggers the eggs to hatch. The larvae — tiny, maggot-shaped — drop from the mosquito onto the skin. They burrow in.
Now they live there.
Six to eight weeks. Inside a small chamber under the skin, with a tiny breathing pore kept open at the surface so they can breathe. They eat tissue fluid. They grow. The host mostly notices a small tender lump — sometimes itches, sometimes doesn't. When the larva matures, it backs out on its own, drops to the ground, and pupates in the soil. Adult fly emerges weeks later. Lives a week or two. Catches a mosquito. Repeats.
Sheriff Six-Legs has seen plenty of outlaws operate alone. The botfly works the gig economy. *I can't bite you. So I'll hire a mosquito.* Most parasites can't manage their own lives, let alone outsource the wet work. The botfly does both, on a budget of a one-week adult lifespan.
The technical name for the trick is *phoresy* — the act of one species hitching a ride on another for transport. Phoresy is common in the bug world. Mites do it on beetles. Pseudoscorpions do it on flies. But the botfly is the only known species that uses phoresy as a *targeted egg-delivery system*. The mosquito carries it to the address. The host's warmth opens the package. The larva moves in.
There's no drug to kill a botfly larva once it's installed. The proven removal techniques are all about the breathing pore: tape over it, smear bacon fat or petroleum jelly across it, suffocate the larva, and it backs out on its own to find air. Field doctors throughout the Amazon know this. It works. It's slow. The larva eventually loses, leaves, and goes back to being a fly.
What the botfly leaves behind in the host is, biologically, almost nothing — no disease, no permanent damage, just a story the host will tell for the rest of their life.
The bug that doesn't bite. Hires somebody else. Lives under your skin for two months. Backs out on its own.
If the wanted poster were written, the sheriff would put the bullet in big letters at the top: *Approach with caution. Suspect prefers to outsource. Charge: trespass with intent.*
It is one of the wildest acts of subcontracting in the animal kingdom.
Round 'em up. Suit up. And — you may want to wear long sleeves in Costa Rica.