Assertion: rabbit's litter | /r/HasProperty | about 10% of mother’s weight
Facets:
Source sentences:
text: As compared to other viviparous vertebrates, mammals are born small (the average litter is about 10% of mother’s weight), reducing the burden upon their swift mothers, but they deem to become independent of their parents very quickly, perhaps due to the development prolonged by lactation and hastened by endothermy.