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Bombay Hook - Monarch Butterfly laying eggs on milkweed plant

9/22/2017

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This is a photos of a Monarch butterfly, laying eggs on a milkweed plant.  Happens all the time, but there is more to this relationship than simply a butterfly finding a good place for the young to grow up.

​There is way more to this story than I can get into here, but two things are worth knowing.  First, the milkweed plant contains toxic chemicals, and second, that even though monarch numbers have been way down in modern years just planting more milkweed isn't a perfect solution.

​
Picture
Monarch butterfly laying eggs on a milkweed plant at Bombay Hook
So, the milkweed plant is toxic, specifically containing cardenolides that are not fun to eat. But the larval butterflies, you know, caterpillars, eat up milkweed like crazy.  In fact, it is pretty much all they eat, from at least of the 27 species of milkweed in North America.

​And as for the toxins, well, they sequester them.  This allows these cardenolides to stay in their body through metamorphosis and arrive in the adult butterflies, having no seeming effect on the animals.  But you still won't like it if you eat these toxins, so chowing down on a monarch will likely induce vomiting or similar stomach distress.  Animals that eat a monarch butterfly learn that this is not good food, and avoid them in the future.  Nifty little strategy they've got going there.  Side note:  the very tasty Viceroy butterfly mimics a monarch's colors to not get eaten since it looks like the awful-tasting one.

​So with the numbers of monarchs decreasing (mainly due to habitat loss and pesticide spraying), a grand plan was hatched to have gardeners plant more milkweed.  Seems very reasonable, since milkweed makes for a nice garden plant and will attract the pretty butterflies.  Well, all is not perfect here.  Seems like most all of the available milkweed plants to gardeners in the US are tropical milkweeds, which have a problem.  

​Milkweed can carry a parasite that is hard on the butterflies, and they can pick it up during the caterpillar stage while eating the leaves.  They then pass it on to the adults, which weakens them severely and can prevent them from having the strength to migrate (many go all the way to Mexico!).  This whole problem has historically been kept in check by all the milkweeds dying off each winter along with most infected adults.  Each year the unaffected adult butterflies return to relatively unaffected milkweed.

​But tropical milkweed is different.  In parts of the US, like southern Texas, it does not die out but survives the winter.  This provides both for continuing the infection and also a side problem whereby some butterflies now do not continue their migration but just stop there as the milkweed remains present (and continues to infect them).

​So, monarchs have had it tough lately, even with a large effort to help them out.  And this is just a small snippet of the whole story, but certainly an interesting story to learn.


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Bombay Hook - Immature Black-crowned Night Heron

9/17/2017

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The adult black-crowned and yellow-crowned night herons look quite different, but the immatures are quite similar.  You have to get a good look, and we certainly did with this black crowned night heron spotted in a tree at the Bear Swamp Pool.
Picture
Immature black-crowned night heron at the Bear Swamp Pool in Bombay Hook National Wildlife Refuge
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Bombay Hook - Red Fox Kit

9/15/2017

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Red fox are common at Bombay Hook, and we got a fantastic look at the young kit near Bear Swamp Pool.
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A young red fox kit at Bombay Hook
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Bombay Hook - glossy ibis, snowy egret, short-billed dowitcher, semipalmated sandpiper

9/14/2017

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Often the shorebirds were in clusters of mixed species, but this was the only ibis we saw.
Picture
Left to right, more or less, short-billed dowitcher, glossy ibis, snowy egret and semipalmated sandpiper
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Bombay Hook - Lesser Yellowlegs

9/12/2017

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Can anyone tell me how this birds gets its name???  There are two species of yellowlegs found commonly in the eastern US, the greater and lesser.  They look darn near identical but the lesser has a straight bill (the greater's bill is slightly upturned) and the greater has knobbier knees.  
Picture
Lesser yellowlegs at Bombay Hook
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Bombay Hook - snowy egret with fish

9/8/2017

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This snowy egret was catching a lot of fish.  Small fish, so kinda like popcorn where you just have to eat a lot to fill up.
Picture
Snowy egret feeding at Bombay Hook
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Bombay Hook - Great Blue Heron

9/6/2017

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The great blue heron is just a magnificent bird.  This one was spotted in a side bay near Finnis Pool in a shady spot in the forest/swamp.  It was preening, and hence the bill full of feathers.

​
Picture
Great blue heron with feathers in its bill from preening at Bombay Hook
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Bombay Hook - Blue Grosbeak

9/4/2017

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After two almost monotone shorebird pics, I have been ordered by one of my followers to post something more colorful for Labor Day Holiday.  Okay!

​A bird I hadn't expected to see, but one that is apparently fairly abundant near the marsh edges, was a blue grosbeak.  One of my favorite birds from Bombay Hook.
Picture
Blue grosbeak drying out its feathers on a rainy day at Bombay Hook
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Bombay Hook - semipalmated sandpipers

9/1/2017

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Possibly the most common bird on the flats
Picture
Semipalmated sandpipers were feeding, resting and preening
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