By comparing louse dna , a team led by david l. reed of the university of florida has now reconstructed how this strange situation probably came about .
In one house there is a mousy mouse with a louse on its head , holding a hose .
在一座房子里，有一只手上正拿着一根水管，头上顶着一只虱子的灰褐色老鼠。
Jack : when you catch a louse , just put a little of that drug on its mouth and it will die immediately .
杰克：你捉到一只虱子，只要在它嘴上抹一点这种药，虱子就会死去。
Vincent s. smith , a louse taxonomist at the natural history museum in london , has found that the tree stretches so far back in time that the host of the first louse would have been a dinosaur , probably one of the theropod dinosaurs that were the ancestors of birds .
