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Delaware River Watershed Initative

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  Academy scientists sample algae on Cobbs Creek near Bethlehem, Pa., as part of the Delaware River Watershed Initiative.
  Credit: Tess Hooper
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  Farm fertilizers and animal waste flowing into streams can cause problems in the Delaware River Watershed.
  Credit: ANS
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  Academy Research Technician Amanda Chan and Staff Scientist II Sylvan Klein conduct a habitat assessment for a salamander biological survey of the Lehigh River near East Stroudsburg, Pa. Salamanders are key indicators of water quality.
  Credit: Nikita Shah/ANS
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  Drexel University co-op student Nikita Shah evaluates habitat conditions of a stream in the Poconos, Pa., for potential sampling as part of the Delaware River Watershed Initiative.
  Credit: Meg O’Donnell/ANS
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  Academy scientists return to Cobbs Creek near Havertown, Pa., every other year to monitor fish populations and species abundance for a long-term survey. Here they are electrofishing to capture and then release fish.
  Credit: Sylvan Klein/ANS

Dimetron 

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  Ted Daeschler, PhD, the Academy’s vice president for collections, holds a cast of the jaw specimen.
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  A depiction of Dimetrodon with the section of jaw that is now fossilized and a part of the Academy’s collection highlighted. Drawing by Danielle Dufault, Royal Ontario Museum.
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  A lithograph of the fossil from around the time it originally made its way to the Academy’s collection.
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  The Dimetrodon fossil, left, with the CT scan of it used by the Canadian research team. Photo courtesy Kirsten Brink.

Rare Butterfly

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  The live Lexias pardais was a shocking delight when it was spotted in the Academy’s Butterflies! exhibit.
  Credit: Isa Betancourt/ANSP

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  The right wings of this preserved Lexias pardais are characteristic of the female of the species and the left wings are typical of the male. The body’s coloration is exactly split down the middle lengthwise.
  Photo J.D. Weintraub/ANSP Entomology

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  Academy volunteer Chris Johnson (left), here with entomologist Jason Weintraub and the preserved Lexias pardais, couldn’t believe his eyes when he first spotted the rare butterfly in the Butterflies! exhibit.
  Credit: Doug Wechsler/VIREO

Lab and Field Work

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  Dr. Marina Potapova collects diatoms, single-celled algae.
  Credit: ANSP
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  Dr. Clyde Goulden interviews nomadic herders in Monglia who are affected by climate change.
  Credit: Tuya Goulden

•  Chemist Mike Schafer analyzing a water sample.
  Credit: Bruce Tepper/ANSP
•  Fisheries scientist David Keller examines a fish for environmental toxins.
  Credit: Bruce Tepper/ANSP

Ornithology

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  A warbler from the Ornithology collection.
  Credit: Katie O. Clark/ANSP

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  Dr. Nate Rice showing a hummingbird specimen from the Ornithology collection to visiting students.
  Credit: Dennis Murphy/ANSP

Paleontology

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  Tiktaalik fossil site in Nunavut, Canadian Arctic.
  Credit: Ted Daeschler/ANSP

Entomology

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  Entomologist Isabelle Betancourt with a cicada specimen from the Academy’s world-renowned Entomology Collection of about 4 million specimens.
  Credit: ANSP