• Beerwah, Australia:  A federally threatened koala, Phascolarctos cinereus, with her babies at... [Photo of the day - September 2017]
    Beerwah, Australia: A federally threatened koala, Phascolarctos cinereus, with her babies at the Australia Zoo Wildlife Hospital. (natgeophotoark.org) This image is from Photo Ark.
    Joel Sartore/National Geographic Photo Ark
  • Costa Rica:   Honduran White Bats roosting.  This image is from Incredible Bats. [Photo of the day - September 2017]
    Costa Rica: Honduran White Bats roosting. This image is from Incredible Bats.
    Grant Brokensha/Earth Touch (Pty) Ltd
  • Yellowstone National Park:  Wolves have incredible stamina and can run for miles in deep snow... [Photo of the day - September 2017]
    Yellowstone National Park: Wolves have incredible stamina and can run for miles in deep snow when tracking prey. This image is from Inside The Pack.
    National Geographic/iStock
  • Saturn:  CGI of Cassini spacecraft coming up and over the north pole of Saturn where it sees the... [Photo of the day - September 2017]
    Saturn: CGI of Cassini spacecraft coming up and over the north pole of Saturn where it sees the unique hexagon feature and approaches the dive through the gap between the rings and the planet for the first time. This image is from Mission Saturn.
    Exploration Production Inc.
  • Houston, TX:  A Coquerel's sifaka, Propithecus coquereli, at the Houston Zoo.... [Photo of the day - September 2017]
    Houston, TX: A Coquerel's sifaka, Propithecus coquereli, at the Houston Zoo. (natgeophotoark.org.) This image is from Photo Ark.
    Joel Sartore/National Geographic Photo Ark
  • Indonesia:  Crested Macaque. Unusual for a primate, it has striking reddish-brown eyes. Tangkoko... [Photo of the day - September 2017]
    Indonesia: Crested Macaque. Unusual for a primate, it has striking reddish-brown eyes. Tangkoko NP, Sulawesi. This image is from Paradise Islands.
    Terra Mater / Matt Hamilton
  • Kenya:  On the savannah, hyenas and lions are arch rivals. This image is from Inside The Pack. [Photo of the day - September 2017]
    Kenya: On the savannah, hyenas and lions are arch rivals. This image is from Inside The Pack.
    National Geographic/iStock
  • Australia:  Little red flying fox walking upside down on vine. This image is from Incredible Bats. [Photo of the day - September 2017]
    Australia: Little red flying fox walking upside down on vine. This image is from Incredible Bats.
    Mark Lamble/Earth Touch (Pty) Ltd
  • New Orleans, LA:  Angular wing katydids (Microcentrum sp.) at the Insectarium in New Orleans.... [Photo of the day - September 2017]
    New Orleans, LA: Angular wing katydids (Microcentrum sp.) at the Insectarium in New Orleans. These colour variants are found in nature, though anything but green is usually eaten by predators immediately. The Insectarium has been a leader in breeding these colour variants for display in the zoo community. (natgeophotoark.org.) This image is from Photo Ark.
    Joel Sartore/National Geographic Photo Ark
  • Cane Toad. This image is from Man V. Animal. [Photo of the day - September 2017]
    Cane Toad. This image is from Man V. Animal.
    David Wright
  • Red paint dances on speaker diaphragm demonstrating how amplitude affects vibration. This image... [Photo of the day - September 2017]
    Red paint dances on speaker diaphragm demonstrating how amplitude affects vibration. This image is from Science of Stupid.
    National Geographic/Miles Harwood
  • Indonesia:  Crested Macaque and baby. The birth of the usually single offspring happens in the... [Photo of the day - September 2017]
    Indonesia: Crested Macaque and baby. The birth of the usually single offspring happens in the spring when food is more plentiful, Tangkoko NP, Sulawesi . This image is from Paradise Islands.
    Terra Mater / Matt Hamilton
  • Atlanta, GA:  Mei Lun and Mei Huan, twin giant panda cubs, Ailuropoda melanoleuca, at Zoo... [Photo of the day - September 2017]
    Atlanta, GA: Mei Lun and Mei Huan, twin giant panda cubs, Ailuropoda melanoleuca, at Zoo Atlanta. (natgeophotoark.org.) This image is from Photo Ark.
    Joel Sartore/National Geographic Photo Ark