(1) Apparently large numbers of ducks, coots and other waterbirds winter at the lake.(2) Why are grebes, among all the waterbirds , so difficult to maintain in captive environments?(3) ‘The drainage of the marshlands destroyed the wintering and staging habitat of several million migratory waterbirds ,’ Evans said.(4) When alewives return to the rivers, they provide abundant forage for resident and sea-run fish, waterbirds , and raptors.(5) The pond is usually dominated by the usual waterbirds : Mute Swan, Canada Goose, Mallard, American Black Duck, and Double-crested Cormorant.(6) These wetlands are important breeding and migratory stopover sites for many North American waterbirds , including more than 30 species of shorebirds, 9 of which regularly breed in the region.(7) This 2,951-acre facility also provides safe haven for some 50 species of waterbirds , shorebirds, and seabirds.(8) Among some ground-nesting waterbirds , such as gulls and plovers, research has shown that speckling aids egg camouflage.(9) However, there were slight trends for waterbirds , birds that breed at Delta Marsh, and short-distance migrants to arrive earlier over time.(10) There were birds everywhere, waterbirds and shorebirds in the pools, landbirds flying by or sitting on fences.(11) It provides winter habitat for 15 million waterbirds , more than 400,000 geese, and 5 million ducks (one-fifth of the continental population).(12) Maggots feeding on the carcasses could pick up the toxin and be eaten by untargeted waterbirds , especially waterfowl, causing additional deaths and creating an outbreak of avian botulism.(13) In monographic detail, the book covers the terrestrial birds in the Quaternary of New Zealand, treating moa, kiwi, waterbirds , raptors, rails, shorebirds, and the remaining land birds in turn.(14) Now common loons, one of five loon species, are helping scientists better understand the impact of environmental mercury contamination on waterbirds , fish, and other aquatic wildlife.(15) Young waterbirds are taken in hard weather by full-grown birds.(16) The 1991 eruption of Mt. Pinatubo, Philippines, caused circumpolar cooling, delayed snowmelt, and resulted in global reductions in productivity of arctic waterbirds in 1992.
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