| http://www.w3.org/ns/prov#value | - The loss of this nutrient jeopardizes the breeding success of birds???to produce a clutch of eggs, a female bird may require up to 15 times more calcium than a pregnant mammal of equivalent size. [...] In areas where acid rain is most severe, the supplementary calcium-rich foods that female songbirds depend on???snail shells, isopods such as pill bugs, millipedes, and earthworms???may be in short
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