 Female fertility continues through May , June and July , however testosterone production decreases in males and sexual behaviour becomes less overt . Litter sizes decrease as the breeding season draws to a close with no pregnancies occurring after August . The testes of males begin to regress and sperm production ends in September . Does give birth in hollow depressions in the ground . An individual female may have three litters in a year with a 41 to 42 day gestation period . The young weigh about 100 grams ( 3 @.@ 5 oz ) at birth . The leverets ( young hares ) are fully furred and are precocial , being ready to leave the nest as soon as they are born , an adaption to the lack of physical protection relative to that afforded by a burrow . A mother will visit the nest to nurse the leverets for five minutes a day . Young can eat solid food after two weeks and are weaned when they are four weeks old . Hares can live for as long as twelve years . 
