Social behavior and genital swelling in pregnant chimpanzees (Pan troglodytes).

Previous reports of increased sexual activity associated with genital swelling during chimpanzee pregnancy have suggested that the tumescent pregnant female may be regarded as a regularly cycling estrous female. Analysis of additional data from seven pregnant and eight cycling females, however, indicated that tumescent pregnant females differed from cycling females in some social interactions with males. As in earlier reports, pregnant females were more receptive to male-initiated copulatory bouts.

Pseudoaneurysm of the left ventricle complicated by Salmonella typhimurium infection. Recognition by two-dimensional echocardiography.

A patient is described with a large posterior left ventricular pseudoaneurysm complicated by Salmonella typhimurium infection. M-mode echocardiography displayed a massive echo-free space behind the posterior left ventricular wall, and two-dimensional echocardiography specifically defined the orifice and saccular contour of the false aneurysm. These findings were confirmed by cardiac catheterization and surgery.

Continual sexual receptivity in the female chimpanzee (Pan troglodytes).

Daily observations during a 5-year period showed that the mean frequencies of copulation per day during various sexual states of the female chimpanzee were almost identical, except for during maximum tumescence and lactation. The mean frequency of observed copulation peaked during maximum tumescence and was lowest during lactation.