By Rand Paul
Obama acts as though we no longer have a Constitution
Ruby-throated hummingbirds are migrating to North America weeks earlier than in decades past, and research indicates that higher temperatures in their winter habitat may be the reason.
he added that sometimes too much emphasis is placed on the earliest date a bird appears.
"What really counts, biologically, is whether the peak period of migration has actually changed," he said. "That is what would most likely affect population biology."
