iNaturalist - Nature at Your Fingertips. Works on all devices. 

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eBird - Transforms your bird sightings into science and conservation. 

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Maryland Ornithological Society - Nonprofit, statewide organization of people interested in birds and nature. 

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Audubon Mid-Atlantic - Protecting birds and the places they need. 

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MD Biodiversity Project - Nonprofit focused on cataloging the living things of Maryland.