TACOMA/EATONVILLE– As a powerful heat wave hits the greater Tacoma area with temperatures nearing 100-degrees, keepers at both Point Defiance Zoo & Aquarium in Tacoma, Wash. and Northwest Trek Wildlife Park in Eatonville, Wash. are finding ways to keep the animals cool. Like many kids on a hot day, the 3-year-old grizzly bears at Northwest Trek plunge, splash and wrestle in water. The bears have a 7-feet-deep pool all to themselves! “We love watching the bears enjoy their pool,” said keeper Haley Withers. “When the temperature is this high, we give them constant access to the water.” Withers also ensures …