But, scientists do know that blue, fin and sperm whales stay down for longer periods of time than, for example, the gray whale.
(scientists; do know; that blue, fin and sperm whales stay down for longer periods of time than, for example, the gray whale) Context(scientists do know,List([5, 23))):(blue, fin and sperm whales; stay than; T:for longer periods of time)
scientists do know,List([5, 23))
scientists blue, fin and sperm whales
do know stay than
that blue, fin and sperm whales stay down for longer periods of time than, for example, the gray whale
T:for longer periods of time