Dead. This same individual was found on December 12, 2022 on the HBS boardwalk (https://www.inaturalist.org/observations/144244107). It was weak and when it tried to fly it landed in the lake and swam to shore. A trained bat biologist gave it some sugar water and it was place on the trunk of a Chinese Chestnut tree facing south. It stayed here for the next 10 days but could not survive the drastic 40 degree drop in temperature (1 degree F today with -17 degree F windchill). Found frozen on ground. Kept as specimen for the HBS collection.

Repost with some extra pictures.

Pictures 1 and 2 show the two mandibles, left and right respectively. Picture 3 shows the upper jaw and roof of the mouth, and picture 4 shows some fragments with stuck teeth. Pictures 5 and 6 show the bat as I found it, mummified and crushed. Pictures 7, 8, and 9 show the approximate measurements of the humerus, ulna, and wrist to wingtip respectively. Picture 10 shows the distinct triangular nose-leaf that sets R. cystops apart from R. microphyllum as I have written about in this journal.

Unfortunately the tail was broken off so that can't be used as a distinguishing feature, but this bat was recovered from this Egyptian mouse-tailed bat roost.

Though this bat is very heavily damaged, it was complete enough for me to get some wing measurements. Along with the distinct nose and the location, the forearm measurement of ~50mm lines up with the expected 47–59mm for R. cystops, and would be too small for the expected 64–71mm for R. microphyllum.