Found it on my son's hair after a 10min visit to our veggies garden. My guess is that it might be a tick but we are not in an area of lime disease and although it's an open, rather unkept, field the only mammals I see around are 2-3 stray(?) cats.
The photo was done using a stereoscope+smartphone. The dark lines underneath are .4 to .5 mm.
Ticks exist outside of Lyme disease zones. And it's easy to pick them up in fields where animals roam. Doesn't even have to be high traffic. Plus, there was recently news that the little buggers can use static electricity to passively "jump" onto animals and humans, which is just extra annoying.
Are you looking for a species ID? I'm not trained in such things, but I can try to search up similar critters if you like, but it's definitely a tick of some variety.
Edit: did a quick search for poo and giggles (and ticks). Looks like a brown dog tick
A tick for sure. Which species I don't know. Whereabouts in the world is this veggie garden?
Also, ticks often climb to trees or tall grasses and let themselves fall when they sense a potential host underneath. I doubt your kid got it straight from the cats, and as for mammals- you see cats, but are you sure you don't have any foxes, raccoons, rats, bats, kangaroos, possums, deer, squirrels, dogs... ?
I'll second southsamurai and agree with Rhipicephalus sanguineus, the brown dog tick. Shape of the capitulum checks out, it has visible eyes, similar body and so on.