Hooper, 1937 Notes on Captive Reithrodontomys Berkley, Alameda C., Calif. Mar. 10, 1937 Bar between 12 o? and 2 m? & down tonight. The two are now in the same cage. No auto[gonism] Mar. 11, Still no auto[gonism]. Both in same cotto[r]. April 6, 2 m? and 12 o? now separated into adjoining cages. No signs of auto[gonism] noted during period when the two were together. One thing noted tonight when I was clearing the cages may be of significance. Reithro-dontomys megalotis are much more active than R. raviventris - this has been evident ever since both birds were confined; the former climbs and jumps about wildly; the latter seldom climbs up on the wire, and has never been observed to jump to the side or top of the cage as the megalotis does. Well, anyway, tonight the megalotis, as usual, could not well be cornered - it jumped about on the bottom and sides of the cage attempting to escape. The raviventris on the other hand seldom ran on the sides of the cage (up off the substrata, thus) and attempted to burrow in the sawdust of the cage floor. This was a means of