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Reproduction and life cycle

The tiger generally mates all year round, particularly between November and April. A tigress is in oestrus for three to six days at a time, separated by three to nine week intervals. A resident male mates with all the females within his home range, who signal their receptiveness by roaring and marking. Younger, transient males are also attracted, leading to a fight in which the more dominant, resident male drives the usurper off. During courtship, the male is cautious with the female as he waits for her to show signs she is ready to mate. She signals to him by positioning herself in lordosis with her tail to the side. Copulation typically lasts no more than 20 seconds, with the male biting the female by the scruff of her neck. After it is finished, the male quickly pulls away as the female may turn and slap him. Tiger pairs may stay together for up to four days and mate multiple times. Gestation lasts around or over three months.

A tigress gives birth in a secluded location, be it in dense vegetation, in a cave or under a rocky shelter. Litters consist of as many as seven cubs, but two or three are more typical. Newborn cubs weigh 785–1,610 g (27.7–56.8 oz) and are blind and altricial. The mother licks and cleans her cubs, suckles them and viciously defends them from any potential threat. Cubs open their eyes at the age of three to 14 days and their vision becomes clear after a few more weeks. They can leave the denning site after two months and around the same time they start eating meat. The mother only leaves them alone to hunt and even then she does not travel far. When she suspects an area is no longer safe, she moves her cubs to a new spot, transporting them one by one by grabbing them by the scruff of the neck with her mouth. A tigress in Sikhote-Alin Biosphere Reserve maximised the time spent with her cubs by reducing her home range, killing larger prey and returning to her den more rapidly than without cubs; when the cubs started to eat meat, she took them to kill sites, thereby optimising their protection and access to food. In the same reserve, one of 21 cubs died in over eight years of monitoring and mortality did not differ between male and female juveniles. Tiger monitoring over six years in Ranthambore Tiger Reserve indicated an average annual survival rate of around 85 percent for 74 male and female cubs; survival rate increased to 97 percent for both males and female juveniles of one to two years of age. Causes of cub mortality include predators, floods, fires, death of the mother and fatal injuries.

After around two months, the cubs are able to follow their mother. They still hide in vegetation when she goes hunting. Young bond through play fighting and practice stalking. A hierarchy develops in the litter, with the biggest cub, often a male, being the most dominant and the first to eat its fill at a kill. Around the age of six months, cubs are fully weaned and have more freedom to explore their environment. Between eight and ten months, they accompany their mother on hunts. A cub can make a kill as early as 11 months and reach independence as a juvenile of 18 to 24 months of age; males become independent earlier than females. Radio-collared tigers in Chitwan started leaving their natal areas at the age of 19 months. Young females are sexually mature at three to four years, whereas males are at four to five years. Generation length of the tiger is about 7–10 years. Wild Bengal tigers live 12–15 years. Data from the International Tiger Studbook 1938–2018 indicate that captive tigers lived up to 19 years.

The father does not play a role in raising the young, but he encounters and interacts with them. The resident male appears to visit the female–cub families within his home range. They socialise and even share kills. One male was recorded looking after cubs whose mother had died. By defending his home range, the male protects the females and cubs from other males. When a new male takes over, dependent cubs are at risk of infanticide as the male attempts to sire his own young with the females. A seven-year long study in Chitwan National Park revealed that 12 of 56 detected cubs and juveniles were killed by new males taking over home ranges.