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Laney and the zebra swallowtail - Chris Barnhart

Similar to the annual first baby born news story on New Year's Day, the Butterfly House is happy to announce the first new arrival of 2016.  This zebra swallowtail emerged from its chrysalis last week.  Here it is being studied by Laney Barnhart.

Several volunteers bring home butterfly caterpillars during the summer, feeding them until they pupate, to provide a new brood when the Butterfly House opens in the spring. The plan is to bring the pupae out of storage in the spring in time for a new "graduating class" on opening day. The winter sleep is called “diapause’ and if the chrysalides are kept cool, and if the days are short, hatching will wait until spring.

However in this case, a caterpillar escaped and climbed to the underside of a cabinet to pupate.  It was not the first to have escaped and the first notice of this as the days lengthen is a butterfly fluttering around the house, wondering where all the flowers are.

The remarkable part of this story is.....January?  What was it possibly thinking?   Actually we don't know exactly what tells a butterfly when to eclose (emerge from its chrysalis).  In the wild, it is critical for the emergence to be timed to the presence of nectar sources and caterpillar food plants, in this case pawpaw leaves.  Clues could be the length of days, increasing mean temperature, or even some biological clock ticking away within the pupa.

The rest of its classmates formed their pupae and were stored out in the garage, where they see mainly normal light cycle and temperature. They are kept in a wine cooler, but it has a glass front, and it only chills them if there is a warm spell. The idea is to keep them on a normal schedule to emerge in the spring so  they are not in the dark, literally or figuratively. 

This zebra likely had no concept of the seasonal change by length of days. The house temperature was relatively stable and no sun reached its chrysalis under the cabinet.  Did it "think" it was March, the earliest time of normal emergence?  Either way this zebra swallowtail must have been very disappointed.

I recall a college roommate setting my alarm clock to wake me an hour early for an early morning class.  The position of the sun and the paucity of cars on campus didn't register until I found the building locked.  I can relate to this zebra's confusion.  The only "pawpaw" they could see was Chris.  That must have felt like the pull on the locked classroom door.

Bison Purity

North American Bison - Library.sandiegozoo.org

There is good news out of Utah where a genetically pure herd of bison has been discovered.  Following the near extinction of the species during the 1800s, conservation has maintained a few herds in Canada and Yellowstone National Park.  Due to intermixing with cattle, most herds have more than a little domestic cattle genes in their bloodstreams.  The DNA studies demonstrate that this herd in the Henry Mountains of southern Utah is unique.

"We’ve got a very, very special case in that the Henry Mountains bison is actually in fact the only population of bison in existence which is now both genetically pure and is free of the disease brucellosis and is free-ranging on public land co-mingling with cattle and is legally hunted.  So, we have this very unique population which is one of a kind. It’s a large credit to the Utah Division of Wildlife Resources, the Bureau of Land Management, and the local Henry Mountains Grazing Association. Over the years, they worked together to conserve this resource.” Dr. Johan du Toit, professor of ecology, Utah State University

The sad story of the near extinction of a species that once ranged across the United States in numbers estimated at 30 to 60 million beasts is summarized in this article from the National Humanities Center.  Much like the extinction of the megafauna 13,000 years ago, it is due to the confluence of many factors.  A period of drought in the early 1800s may have been a factor.  This was followed by increasing  hunting pressures by Native Americans using improved methods such as the development of the bow and arrow, introduction of Spanish horses and finally metal and guns.

The westward push of settlers and the extension of the railroads after the civil war increased market hunting for hides, meat and even delicacies such as bison tongue.  Any recognition of the diminishing numbers was numbed by governmental policy encouraging the total elimination of bison as a way to force settlement and agriculture upon the Native American tribes who posed unwanted competition for western lands.*

There are an estimated 500,000 bison in the US, the vast majority raised commercially in herds for meat consumption.  Less than 20,000 are considered wild, mostly in Yellowstone and Canada, and most of these have some degree of cattle genes.  The Henry Mountain bison represent a resource for reestablishing a pure strain of the original beasts that once roamed the country including our Ozarks.

* American University, Washington D.C.

Abnormal Antlers

 Injured leg leading to spike antler -Todd Reabe in QDMA.com

Antler size and abnormalities are a big topic among deer hunters, generally the bigger the better.  This is mainly a result of the effects of testosterone, not on deer antlers but on some male hunters' brains.  More on testosterone effects on deer later.

I have heard hunters talk of trying to harvest deer with abnormal antlers to "improve the genetics" of the herd.  This is usually applied to bucks with deformed or stunted antlers on one side.  An example of such a buck was sent to me by Dave Shanholzer in the article Leg Injuries can Effect Antler Growth.  As strange as it sounds, it is true.  It even has its own acronym, SOOS, (spike on one side.)

A recent study reported in QDMA.Com confirmed that injuries to a buck's leg is one cause of stunting of the antler on the opposite side of the head.  Why and how this occurs isn't known.  Gabe Karnes, studying this phenomenon for his PhD reports that "It is well documented that antler deformities due to skeletal injuries progressively disappear with each subsequent antler growth cycle, meaning you can expect most SOOS yearling bucks to develop normal antlers in another year or two."

In other cases it is due to damage to the "antlerogenic periosteum," the tissue on the skull that produces antlers.  Scar tissue due to injury, likely battle scars from males fighting over females (imagine that!) affects the blood vessels and the normal development of antlers.

22 point rack - KY3

The bottom line is that there is no reason to preferentially kill SOOS bucks to "improve the herd."   Besides, it may not even be a buck!  A recent story on KY3 showed a massive set of antlers on a 22 point buck, make that doe!  Curtis Russel of Billings had been hunting for it after seeing it on his game camera but wasn't prepared for a she.  According to Derek Farwell of MDC:

"Out of almost 250,000 deer harvested in the state each year about five are antlered does, but I have never seen one with that many points.  There's a couple different situations where this may occur; one, the doe may simply have a high level of male hormone such as testosterone.  The other situation is maybe a hermaphrodite where it has the reproductive organs of both the male and female deer."

Russel say that he watched it as it pushed a small buck around, thinking that was  more evidence it was a male.  I guess you could say it was "passing the buck."

Carnivorous Turtle

Lepidopteran Lunch - Brian Edmond

Brian Edmond sent me the photograph above of a three-toed box turtle munching on a butterfly.  When I saw the picture on my phone I guessed it was a Wood Satyr, based on the tan eye spots with black "pupils" on the wing.  When I brought it up on the computer later, the white spots that had looked like the gravel drive were actually wing tip spots of a Hackberry Emperor (Asterocampa_celtis).
 

Hackberry Emperor - Bob Moul

Wood Satyr - Bob Moul

Eye spots like these are common, found on several similar butterflies.  The Wood Satyr lacks the white spots on the wing tip.  Northern Pearly-eyes have a small white "pearl" in the black eye spots.  The Painted Lady has white spotted wing tips but the eye spots are much smaller and located on an orange background.

Painted Lady - Bob Moul

Northern Pearly-eye - Bob Moul

Three-toed box turtles are the official State Reptile of Missouri.  They eat insects, worms, slugs, mushrooms and green plants.  They require protein to grow so a partially carnivorous diet is important.  They have been known to eat poisonous mushrooms without harm.  In captivity they are shy about eating, pausing when observed closely.  Brian noted that the turtle stopped eating while he was photographing it, resuming when he left.  This is probably another example of "freezing" in animals sensing danger.

The Internet is a great source of information, and misinformation.  Googling "do turtles eat butterflies" brought a straightforward "NO".*  On the other hand there has been a lot on some butterflies that feed on turtles.  A report on Livescience.com describes butterflies that cover the heads of yellow-spotted river turtles in the western Amazon rain forest.  They gather there to collect the tears of turtles which contains sodium.  Butterflies require sodium that is missing in their diets.  Missouri butterflies can get minerals from moist soil, animal urine and dung, etc while the Amazon soils are very sodium depleted.

* No butterflies were injured in this blog as it was "definitely road kill" when found by the turtle. 

Bearly Denning

Bear in its den - MDC

By now many plant and animal species have entered dormancy, a period when growth slows or stops in response to seasonal changes of winter.  For many animals this means periods of torpor,  where metabolic activity slows, body temperature drops and there may be periods of prolonged sleep.  I was taught this was in response to cold weather, but it is also a method of surviving periods of reduced availability of food.

The difference between hibernation and torpor is mainly a matter of degree and the terms tend to be used interchangeably in many sources.  Hibernation can be thought of as an extended degree of torpor.  Hibernating animals will wake up briefly during the winter and may even emerge for a period on occasion.  On the other hand, the increased metabolic cost of arousal may be harmful, such as when bats are aroused and fly, burning up their winter metabolic reserves. 

Hibernation and torpor may be triggered by decreasing temperatures and day length, or in other species by the lack of metabolic resources.  In either case the slowing of metabolic activity is a means of storing energy.  Some snakes will hibernate in the extreme heat of summer, a response called aestivation.

During my medical residency in Minnesota there was a research project studying bear metabolism during hibernation.  I was "given the opportunity" to perform a liver biopsy on a hibernating bear.  The plan was to sneak into the hibernaculum, plunge a large bore needle between the ribs and maintaining suction, extract a core of liver tissue and leave before the bear was fully awake.  I was out of town at the appointed time and missed my chance ---  I was also young and foolish enough to be disappointed in missing the "opportunity."

Bears should be denning by now unless they are confused by the warm winter weather.  I was reminded of this by a recent story in the New York Times.  A scout leader in New Jersey was showing his troops a cave he had been checking for many years.  He crawled through a tight crevasse at the opening and was attacked by a bear denning inside.   You should read the rest before crawling into a winter cave.

Missouri bears can den in hollow trees, root wads, caves or ground nests in brush.  A bear den can be a busy place as seen in this MDC Video from Jeff Beringer.

The scout master has been released from the hospital with minor injuries as reported on cnn.com

Predators in Cities

Mountain Lion P-22 in Los Angeles - National Park Service

The New York Times recently ran an article titled "Bright Lights, Big Predators", discussing the implications of predatory wildlife that move into urban areas to co-exist with human society.  Coyotes in Chicago number 4,000 and they have gone from a pariah to an accepted part of the landscape, snacking on the odd pet but otherwise just another irritating neighbor.  Leopards in Mumbai are now an accepted part of life.

Why cities?  You might argue that it is only fair as we have moved into their territory and compete for their resources.  Our urban environment is filled with tiny islands of "wilderness."  Chicago's Cook County alone has 69,000 acres of Forest Preserves scattered around housing additions and strip malls.  Coyotes have a smorgasbord of rabbits, raccoons, and possums in addition to feral cats and the occasional small dog.  In Missouri, the bear population increasingly shows up around towns near our forests.  In Los Angeles there is a resident mountain lion (http://www.newyorker.com/tech/elements/ballad-p22-mountain-lion-los-angeles) now named P-22.

Even in Mumbai, a leopard in a park doesn't cause the fear that traffic accidents and crime present.  As our big wildlife such as bears and even occasional mountain lions come in contact with society, we watch with a mixture of fascination and a little fear.  There is reason to fear wildlife.  In 2011 alone, wildlife caused 7 deaths in Missouri and 191 deaths nationwide.  This was from animal-vehicle crashes, predominantly the deadly deer.

After reading the article above and the preceding blog on mountain lions in Missouri, I think you will want to take additional safety precautions..... be sure your seat belt is fastened at all times and never text while driving.  The predators will take care of themselves.

Mountain Lions

Mountain Lion - MDC

I just came across a video describing the status of mountain lions in Missouri.  We hear a lot of false reports, news stories of a sighting or even a road kill, so it is hard to keep track of the big picture.  This MDC video by Todd Meese covers the subject in the first 28 minutes, everything you wanted to know about this animal which was commonly encountered in the early 1800s.

This MDC website has the latest information on the subject.
Update from National Geographic.

Thanks to Dave Shanholzer for sending me the video link.