The development of birds can be classified into one of two main types: precocial and altricial. Precocial birds, like chickens, ducks and owls, hatch out with a warm covering of down feathers. A precocial chick can keep its body reasonably warm in the absence of heat from an incubating parent. Some precocial chicks can feed themselves soon after hatching.
The record for the longest estimated home run in a major-league game is 634 ft., by Mickey Mantle for the New York Yankees against the Detroit Tigers at Briggs Stadium in Detroit, Michigan, in September 1960.
Confidence votes 28. Answer: It's a tie! The MLB National League rookie home run record is jointly held by Wally Berger, who knocked 38 out of the park in his first season with the Boston Braves in 1930, and by Frank Robinson, who matched that feat in his debut with the Cincinatti Reds in 1956.Berger was 25 when he set the mark, older than the average rookie. The AL rookie home run record is held by Mark McGwire who hit 49 home runs for the Oakland Athletics in 1987.