They seemed to be taking whole reeds, perhaps to line their nests in the rocks. Rats can be awfully finicky about their nests.
Rattus rattus, baby. Updated: Evidently actually Rattus norvegicus. See comments.
amphibians Arizona bees beetles birding birds Black Rock Forest books Britain Bronx Brooklyn Brooklyn Botanic Garden Brooklyn Bridge Park Bush Terminal butterflies caterpillars Central Park cicadas Climate crabs Croton Point damselflies Dartmoor Dead Horse Bay dragonflies elm fish flowers Floyd Bennett Field Fort Tilden Four Sparrow Marsh frogs fungus galls Gastropoda Geology Gowanus Great Swamp Green-Wood honey bees horseshoe crab Hudson Iceland insects invertebrates Inwood Jamaica Bay ladybugs Maine mammals Marine Park mollusca Montreal moths mushrooms Nantucket New York Botanical Garden Odonata owls plants Prospect Park reptiles shells slugs snails spiders St. John Staten Island Sunset Park Texas Thoreau trees turtles Virgin Gorda wasps
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