But March 21 comes and goes every year without anyone pausing to remember that Washington broke the NFL's modern-era color barrier as a member of the Los Angeles Rams on that date in 1946 -- a full year before Robinson's milestone. Every baseball player wears Robinson's No. 42 on April 15.
The finding is the journal Public Library of Science ONE. [Sarah Klemuk et al.,  Adapted toRoar: Functional Morphology of Tiger and Lion Vocal Folds ]. When we say loud, we mean loud. Lion roars can travel over five miles, andreach up to 114 decibels, which is asloud as a jet airplane taking off. The researchers suggest that the fatis there to cushion the cords, and to provide tissue for repair if the cords get damaged.
MOST OF THE TIME, it's in an animal's best interest to be undetectable, but sometimes it's useful to be loud-very loud. While a normal human conversation registers at about 60 decibels (dB), some animals can screech, scream and holler much louder than a subway train (100dB). The human threshold of pain is 120, and at 160 your eardrum will rupture, but many loud animal calls are not designed for human ears.