Ord's Kangaroo Rat 



ings through any one of which the little rat could plunge down 

 to his subterranean dwelling. These openings led to a rather in- 

 tricate series of passageways opening one into the other in such 

 a way as to lead the intruder to another exit rather than to the 

 nest. The latter he found was reached by a short branch lead- 

 ing from one of the above passageways, the mouth of which was 

 apparently plugged up with earth by the little animal before de- 

 parting, so as to further shield the nest from any intruders. The 

 nest had a thick felting of fine grass an^w.epd, silk^and. a soft 

 lining of feathers. Two other chambers ,"w"erc filled w,i.t|r over a 

 pint of sunflower seeds and evidently.-, served., as., sto/ehouses. 

 Of the mouse itself, which Mr. Tho'mbson * k'ept ; tfor Vi iti'rae in 

 captivity, he writes: "He was the embodiment of restless energy. 

 Palpitating with life from the tip of his translucent nose and ears 

 to the end of his vibrant tail. He could cross the box at a single 

 bound, and I now saw the purpose of his huge tail. In the 

 extraordinary long flying leaps that Perodipus makes the tuft 

 on the end does for him what the feathers do for an arrow. 

 They keep him straight in the air in his trajectory. 

 He was the most indefatigable little miner that I ever saw. Those 

 little pinky-white paws, not much larger than a pencil point, 

 seemed never weary of digging, and would send the earth out 

 between his hind legs in little jets like a steam-shovel. He 

 seemed tireless at his work. He first tunnelled the whole mass 

 through and through and I doubt not made and unmade several 

 ideal underground residences and solved many problems of rapid 

 underground transit. Then he embarked in some landscape garden- 

 ing schemes and made it his nightly business to entirely change 

 the geography of his whole country, laboriously making hills and 

 canyons wheresoever seemed unto him good." Mr. Thompson had 

 reason to suppose that the faint bird-like twitterings sometimes 

 heard at night by cowboys and others on the plains are to be 

 attributed to the Perodipus, being analogous to the songs which 

 are uttered by some individuals of the common house mouse and 

 the white-footed mouse of our woods. 



101 



