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Celebrating 100 Years of Science! | 1925-2025
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Symbol Package
Top view of a flying adult Spotted Lanternfly
Lycorma delicatula adult (Spotted Lanternfly):
Side view illustration of an adult Spotted Lanternfly
Lycorma delicatula adult (Spotted Lanternfly):
Partially covered egg mass of the Spotted Lanternfly
Lycorma delicatula egg mass (Spotted Lanternfly):
Uncovered egg mass of the Spotted Lanternfly
Lycorma delicatula egg mass (Spotted Lanternfly):
Top view of early stage Spotted Lanternfly nymph
Lycorma delicatula nymph (Spotted Lanternfly):
Top view of late stage Spotted Lanternfly nymph
Lycorma delicatula nymph (Spotted Lanternfly):
Impervious surfaces like roofs and parking lots cannot absorb water. A large volume of rainfall in a relatively short period of time produces runoff, which carries sediments and chemicals into bodies of water. Storm drains cannot always handle the volume of water, or get backed up for other reasons, creating puddles like this one in a parking lot. Video taken in Arnold, Maryland.
Stormwater runoff
During heavy rainfall, water runs off impervious surfaces like sidewalks. Manmade or paved surfaces like roofs and roads cannot absorb water like vegetated surfaces, so rainwater flows directly into the nearest body of water, carrying sediments and other pollutants with it.
Runoff in action
An illustration of the American River Otter (Lontra canadensis) swimming underwater.
Lontra canadensis (American River Otter): swimming
An adult Lesser Scaup in flight
Aythya affinis (Lesser Scaup)
Woman rowing
Woman rowing
side view of bird
Mniotilta varia (black and white warbler)
Side view of bird
Vireo solitarius (Blue headed vireo)
Illustration of the many forms of man-made microdebris, particles smaller than 5 mm made of synthetic or semi-synthetic materials.
Man-made microdebris
Accipiter tachiro (African Goshawk) sitting in a tree in South Luangwa National Park in Zambia.
Accipiter tachiro (African Goshawk)
Two juvenile impala play-fighting at South Luangwa National Park in Zambia.
Aepyceros melampus (Impala)
Two juvenile impala play-fighting at South Luangwa National Park in Zambia.
Aepyceros melampus (Impala) 2
Impala at South Luangwa National Park in Zambia.
Aepyceros melampus (Impala) 3
Balearica regulorum (Grey crowned crane) at South Luangwa National Park in Zambia.
Balearica regulorum (Grey crowned crane)
Giraffa camelopardalis thornicrofti (Thornicroft's giraffe) in South Luangwa National Park, Zambia.
Giraffa camelopardalis thornicrofti…
Giraffa camelopardalis thornicrofti (Thornicroft's giraffe) eating leaves in South Luangwa National Park, Zambia.
Giraffa camelopardalis thornicrofti…
Giraffa camelopardalis thornicrofti (Thornicroft's giraffe) in South Luangwa National Park, Zambia.
Giraffa camelopardalis thornicrofti…
Giraffa camelopardalis thornicrofti (Thornicroft's giraffe) in South Luangwa National Park, Zambia.
Giraffa camelopardalis thornicrofti…
Giraffa camelopardalis thornicrofti (Thornicroft's giraffe) in South Luangwa National Park, Zambia.
Giraffa camelopardalis thornicrofti…
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