By Ranger Steve Mueller
Anyone spending time outdoors has most likely made exciting observations worth sharing. Some might be new discoveries or are experiences new to others. One time a man told me he had an experience I would not believe. He said he was walking in a stream and killed a trout by stepping on it. I replied, I believed him because the same thing happened to me.
I was wading in Calf Creek in Utah, when a trout tried to swim past me as I was stepping down. It was caught between foot and rock. I tried to shift my weight quickly to the other foot but it was too late. The fish began to roll downstream. I held it for several minutes in the water hoping it would recover. Sadly, it did not survive.
A new discovery occurred in the 1970’s while I was observing birds. As a thundershower approached, I noticed an American Robin began singing an altered song. Four minutes later, the sky opened with rain. I listened to other robins shortly before thundershowers and repeatedly they gave me a four-minute rain warning.
When camping with a group of fellow college students in the Manti LaSal Mountains of Utah, the sky was overcast but appeared unchanging. Suddenly, I heard the robin rain song and told others we had four minutes to get into tents. They did not believe me. I entered my tent and they were caught in the rain four minutes later. The storm came and went. Later another rain song was heard under an unchanging sky and I gave warning. Others did not enter tents and got wet. A third time when I heard the rain song, fellow campers went to their tents and it began raining four minutes later.
When a gentle rain arrives, robins have not provided warning but when it was a thundershower they did. I presume a greater barometric pressure change occurs when a thundershower approaches and stimulates their rain song. An ornithology professor told me he never noticed the four-minute warning.
Another time I was sketching a rock formation at Capitol Reef National Park, when I heard a Black-headed Grosbeak provide a song I thought might be a rain song. I looked at my watch and immediately headed for my campsite a half mile away. Seven minutes later it began to rain. Since then, I have referred to the grosbeak as the seven-minute bird.
Each of us can make original discoveries when we pay close attention to occurrences in nature niches. I have not prepared research experiments to prove robins or grosbeaks sing a unique song before the rains begin. Someone else will need to do that but I have warned others based on my discovery.
I made an unexpected discovery at Bryce Canyon National Park when I watched a parasitoid Sphecid wasp with prey. The wasp was dragging a grasshopper to a burial hole it dug. It had stung and paralyzed the grasshopper. This behavior is known. The wasp lays an egg on the grasshopper and the larva hatches to eat the prey. The wasp larval grows, pupates, emerges as an adult, and is a natural control for grasshopper populations. I did not identify the species of grasshopper or wasp.
Then something more significant occurred. While the wasp was pulling the grasshopper into the hole, a fly appeared at the entrance and began shooting eggs into the hole. The fly eggs would hatch and either feed on the grasshopper or developing wasp. I did not have collecting equipment so the discovery details and fly species will need to be investigated by someone else.
By spending time in the yard observing, you will likely make new discoveries to share with family, friends, or scientists. An exciting, unknown, natural world awaits your discovery.
Natural history questions or topic suggestions can be directed to Ranger Steve (Mueller) at firstname.lastname@example.org – Ody Brook Nature Sanctuary, 13010 Northland Dr. Cedar Springs, MI 49319 or call 616-696-1753.