Final answer:
Other forms of infanticide among langurs include males killing infants in order to increase their chances of fathering their own offspring and when males kill infants to establish dominance and increase their own reproductive success.
Step-by-step explanation:
Infanticide refers to the act of killing an infant. In the case of langurs, there are other forms of infanticide that have been observed. One such form is when a male langur takes over a new group of females after defeating the dominant male. The victorious male may kill any existing infants in order to bring the females back into estrus and increase his chances of fathering his own offspring. This behavior has been observed in several primate species including langurs.
Another form of infanticide among langurs is when a male who is not the father of an infant kills it. This can happen when the male is attempting to establish dominance or assert his own reproductive success. By eliminating the offspring of other males, the male langur increases his own chances of siring offspring with the females.
In both cases, infanticide serves as a reproductive strategy for langurs and other primates to ensure their own genes are passed on to the next generation.