Author: David Mathre

I am a scientist by training (Eckerd College, BSc; Caltech, Ph.D.). I worked for 27 years as a Chemist in the Pharmaceutical Industry developing processes to manufacture medicines for human and animal health. I now spend my time as a photographer and world traveler. My interests include the natural world, wildlife, landscapes, sky, and seascapes, travel, and astrophotography. I look for unique ways of viewing the world and presenting my images. I have traveled to over 55 countries in six continents, often on Semester at Sea voyages. While at home in New Jersey, I spend time on home renovation and expansion of a wildflower garden/meadow.

Fourteen-Years Ago (02-April-2007) — New Jersey

Backyard Springtime Nature in New Jersey

Afternoon walkabout: American Crow, American Robin, House Finch, Northern Cardinal. My eBird Checklist.


Afternoon walkabout. Image taken with a Nikon D2xs camera and 80-400 mm VR lens. Individual images in the slideshow are available in my PhotoShelter Gallery.

Thursday (01-April-2021) — New Jersey

Springtime Backyard Nature in New Jersey.

Morning visitors to the patio birdfeeder: Turkey Vulture, Black-capped Chickadee, Tufted Titmouse, House Finch, White-throated Sparrow, Brown-headed Cowbird, Northern Cardinal.

Turkey Vulture Yawning. (David J Mathre)
Turkey Vulture (Cathartes aura). Image taken with a Nikon D850 camera and 500 mm f/4 VR lens. (David J Mathre)


Daily backyard visitors. Individual images in the slideshow are available in my PhotoShelter Gallery.

The Turkey Vulture was up on the patio, just under the birdfeeder. At one point it tried to eat a rotten apple.


Turkey Vulture, portrait images. Individual images in the slideshow are available in my PhotoShelter Gallery.


Turkey Vulture, landscape images. Individual images in the slideshow are available in my PhotoShelter Gallery.

Daily Electric Energy Used (43.1 kWh) from Sense. Daily Solar Electric Energy Produced (50.5 kWh) from Sense and SolSystems. Sunny in the afternoon. Geothermal HVAC system was off. A surplus of 7.4 kWh.

Two-Years Ago (01-April-2019) — New Jersey

Backyard Springtime Nature in New Jersey

Morning Walkabout: Turkey Vulture. My eBird Checklist.

Turkey Vulture. (David J Mathre)
Turkey Vulture warming in the morning sun. Image taken with a Nikon D5 camera and 600 mm f/4 VR lens (ISO 100, 400 mm, f/4, 1/800 sec). (David J Mathre)

Fourteen-Years Ago (01-April-2007) — New Jersey

Backyard Springtime Nature in New Jersey

Afternoon walkabout: Mourning Dove, Northern Mockingbird, American Robin, House Finch, Northern Cardinal. My eBird Checklist.


Afternoon walkabout. Image taken with a Nikon D2xs camera and 80-400 mm VR lens. Individual images in the slideshow are available in my PhotoShelter Gallery.

Wednesday (31-March-2021) — New Jersey

Springtime Backyard Nature in New Jersey.

Morning visitors to the patio birdfeeder: Tufted Titmouse, Carolina Wren, House Finch, Chipping Sparrow, Dark-eyed Junco, Song Sparrow, Brown-headed Cowbird, Northern Cardinal.


Daily backyard visitors. Individual images in the slideshow are available in my PhotoShelter Gallery.

Daily Electric Energy Used (43.5 kWh) from Sense. Daily Solar Electric Energy Produced (15 kWh) from Sense and SolSystems. Cloudy and rainy. Geothermal HVAC system was off. A deficit of 28.5 kWh.

Monthly Electric Energy Used (1798 kWh) from Sense. Daily Solar Electric Energy Produced (1477 kWh) from Sense and SolSystems. A deficit of 321 kWh.