Now Playing: Weather radar picks up widespread bird migration
Now Playing: Video shows frantic pool rescue of boy trapped underwater in lazy river
Now Playing: Former transit commissioner resigns after vulgar rant during traffic stop
Now Playing: Police investigating pit bull attack on NYC subway
Now Playing: Woman kills husband’s mistress, herself: Police
Now Playing: Video shows Florida high school officer body slam student
Now Playing: Dallas police officer dies 1 day after shooting that injured 2 others: Officials
Now Playing: Police drive 84-year-old to hospital to see wife
Now Playing: President George H.W. Bush honors wife with ‘crazy socks’
Now Playing: Young giraffe back with her mother at zoo after escape
Now Playing: Live update on the police shooting in Dallas
Now Playing: Suspect arrested in decades-old ‘Golden State Killer’ case: Sources
Now Playing: Former police officer, 72, arrested in decades-old ‘Golden State Killer’ case
Now Playing: Sanders addresses allegations against Pruitt
Now Playing: Sean Spicer unveils Melania Trump’s wax figure at Madame Tussaud’s
Now Playing: Manhunt underway for person of interest in shooting of 2 police officers, civilian
Now Playing: Teen murders his mother with help from friends, authorities say
Now Playing: Boy, 5, says teachers taped his mouth shut, threw away his lunch
Now Playing: Sweet find as 50,000 honey bees colonize Ohio garage
Now Playing: Dead man’s finger used in effort to unlock phone by police
