Hooper, 1937 Notes on captive Reithrodontomys Berkeley, Alameda Co., Calif. April 6, escape not seen before in Reithrodontomys. This might indicate that raviventris seeks retreat in the ground (it lives in Salicornia - which offers little climbable structure), while the megalotis kind may attempt to escape up off the ground or by running and jumping in its chaparral and grass habitat. April 7, Found the raviventris or back in the cage with the megalotis ?. The former went back thru the hole in the partition to its own cage when I started to catch it. The hole is patched now. Dave Johnson brought in a live Onychomys last night. It is confined in the third section of the cage.