They believed that Koko 's nurturing of the kitten and the skills she gained through playing with dolls would be helpful in Koko 's learning how to nurture an offspring .
Researchers said that she tried to nurse All Ball and was very gentle and loving .
Researchers believed that Koko 's nurturing of the kitten and the skills she gained through playing with dolls would be helpful in Koko 's learning how to nurture an offspring .
Researchers said that she tried to nurse All Ball and was very gentle and loving .