By Tina Mitchell Enjoy cantaloupe or watermelon? The crunch of a crisp apple? That avocado in your guacamole? You might want to thank a bee. Super-pollinators of the flowering world, Colorado’s bees emerge, starting in April, from their hives or their nests underground, in hollow stems, or in tree cavities. More than 20,000 species of bees have been identified worldwide, inhabiting every continent except Antarctica. More than 4,000 species of bees live in the U.S. and Canada: Four times more than all the bird species, six times more than butterflies and 10 times more than mammals. With approximately 950 bee ...