Monday, December 19, 2011

Stuffed


Having just returned from a Thanksgiving vacation in Massachusetts, I had hoped to write about something uniquely New Englandy. To me the greater Boston area is all about clams, lobsters, shorebirds and cranberry bogs. Granted it’s a narrow, stereotypical view but if I could expand my limited expectations then my trip would be a success.

Unfortunately I only spotted a few dumpster gulls and a couple of Deer Ticks (Ixodes scapularis). I probably should have gotten out more. But you know how Thanksgiving is. It’s all about the thanking and the eating and despite picking up a cold on the plane ride up (thanks open air sneezer in seat 24A!) I still managed to eat more than any normal person should at any given meal. It’s a funny thing, I don’t need to eat so much. I just want to and this makes me wonder how much joy a snake gets when it consumes a feast much larger than it appears it should.

A few years ago I was leading a summer camp in Vermont. A couple of kids heard a strange noise in the woods, called me over and we discovered a Common Gartersnake (Thamnophis sirtalis) eating a Green Frog (Lithobates clamitans). Several kids were horrified but for the most part there was great interest in the likelihood that this slender snake could eat this wide-bodied and seemingly unflappable frog. The snake meticulously maneuvered its ever widening mouth to position the frog into an easy transition down its throat.  

Once in the intestine, the gartersnake has the ability to elevate its metabolic rate, increase enzyme activity and blood flow to the digestive system and increase the mass of the intestine, liver and kidney to aid in removing and storing nutrients from its prey. It can just as quickly reverse all of these functions and revert to normal conditions. Ultimately the quick digestive process prevents a snake from slithering about with a large meal in its belly.

No such luck for me on Thanksgiving. My digestive system is used to a pattern of thrice-a-day feedings and I had clearly overwhelmed my system. Happy Belated Thanksgiving. 

Saturday, November 12, 2011

Formerly Known As the Louisiana Heron


I have a book called “American Wildlife Illustrated” from 1940 that sits on my book shelf with all of my other aging natural history references. Some of the books are as new as 2010 but for every day that goes by there is a fact, a theory or a matter of taxonomic nomenclature that becomes wrong, disproved or obsolete. Printed material is old school. Your digital Audubon Guides can be updated when needed.

When I started guiding in the Everglades in the 90’s there was a bird that everyone in the swamps called the Louisiana Heron. I was told it was also called a Tricolored Heron (Egretta tricolor), but people can be stubborn and despite the bird carrying a name of another state, the locals were content to keep the traditional name. I took a few years off from guiding and returned again in 2007. When I pointed to a heron and called it a Louisiana Heron you would have thought I called a Badger a Buffalo. “It’s a Tricolored Heron. Ain’t no one calls it Louisiana Heron no more.” Ok then. Tricolored it is.

To be fair the name change had been approved by the American Ornithologist’s Union in 1983 so everyone had ample time to acclimate to the new colorful name. Why the change? Eliminating local geographic names was deemed more appropriate. After all, the “Louisiana Heron” is found from the eastern seaboard of the United States, south through Texas and in a few spots in Central and South America. The three colors of the Tricolored Heron include a white belly, a powdery blue body and a reddish patch on the back.    

They are occasionally confused with the much larger Great Blue Heron (Ardea herodias) and the similarly sized Little Blue Heron (Egretta caerulea). What always stands out to me is the white crest of feathers that the Tricolored adults develop during the breeding season. It pops out a bit in the back and looks like a mullet hairstyle.

There are still some old school birders who prefer “Louisiana Heron” but Tricolored Heron is certainly the norm. What you won’t see or hear anywhere  is someone petitioning for a name change to “Mullet Crested Heron”.