ZOOLOGICAL SOCIETY BULLETIN 107 
THE MOTHER OF THE FIRST CAPTIVE BORN CHIMPANZEE 
Picture at right shows the young animal. 
measurements made when it died nine days later 
showed the estimated weight and height as ap- 
proximately correct. The baby was active, and 
clung to the hair of the mother’s abdomen. In 
lying down on her side Suzette always shifted 
the baby to the upper side. She handled it very 
gently, and always changed it from side to side 
by first supporting the head and lifting it. 
Being present when the baby made its first 
sound or cry, I was able to note the effect of this 
on Suzette. While Suzette was half reclining 
and busily engaged in eating her first meal, 
after the baby was born, the baby uttered a low, 
plaintive cry, the sound of which caused Suzette 
to stop eating, and to sit upright and listen with 
a startled expression on her face. When the cry 
was repeated she looked down at the baby, and 
then hurriedly began making her bed anew, fuss- 
ing with the straw and shifting the baby from 
the right to the left groin. 
Whenever Suzette would lie down without 
shifting the baby to the uppermost groin, the 
slight pressure exerted on the baby would al- 
ways make it cry. This was always a signal for 
Suzette to hurriedly sit up, shift the baby, and 
rearrange the straw bedding. During these 
times the baby would often grasp some of the 
straws in its hands or feet, but Suzette would 
always take them away, not by pulling the 
straws, but by gently opening the hand and 
taking the straws out of them, carefully looking 
between the fingers as if searching for pieces 
which might be retained there. 
The following day, July 15, Suzette appeared 
somewhat depressed, and coughed a good deal, 
but when food was offered she appeared hungry. 
She drank milk containing raw eggs, and ate 
some bananas and stewed prunes. The breasts 
were not enlarged, and there were no evidences 
of the secretion of milk. The baby was kept 
tucked in Suzette’s groin, but while the hands 
and feet were frequently in motion the position 
remained the same. Both Suzette and the baby 
slept frequently during the day, but whenever 
she would hear Boma calling from the outer 
cage she always roused up, and made an attempt 
to join him by going to the outer cage door. 
On July 16, there was a noticeable enlarge- 
ment of the mammary glands, and Suzette was 
paying more marked attention to the baby. She 
frequently examined the inside of its hands and 
feet, and would lie on her back and fondle the 
baby’s feet without looking at them. She also 
would sit upright and make a chuckling sound, 
accompanied by a vibration of the abdominal 
muscles, which expresses the emotion of 
pleasure, and is frequently observed in chim- 
panzees when they are tickled under the arms 
by their keeper. On this day the baby was 
carried higher on the abdomen of the mother, 
and clung by holding on with hands and feet 
tightly grasped to the hair. 
On July 17, Suzette was depressed, and 
showed very little interest in her food. She had 
a distressing cough, fever and headache, the 
latter manifested by keeping her hands pressed 
over her forehead. For most of the day she was 
restless and drowsy. Her breasts showed some 
enlargement, but there were no evidences of milk 
secretion. 
