| 31. | These birds feed on small rodents, which are essential in perpetuating the life cycle of a deer tick.
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| 32. | Despite what he spends monthly on bird feed, he considers what he gives them little more than dessert.
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| 33. | Institute officials say watching the birds feed and care for the young will be the highlight of the summer.
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| 34. | These largely solitary birds feed on fruits, berries, insects and small vertebrates ( such as frogs ).
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| 35. | These birds feed on insects on the back of cattle, which helps to keep them disease-free.
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| 36. | These birds feed on a variety of aquatic invertebrates including adult flies, mayflies, beetles, crustacea and molluscs.
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| 37. | These birds feed on the fruit of the rafia palm which produces its fruit once every twenty years before dying.
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| 38. | Various species of birds feed off the river or nest on it, some being found both at sea and inland.
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| 39. | Many frugivorous birds feed mainly on fruits until nesting season, when they incorporate protein-rich insects into their diet.
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| 40. | These birds feed on insects, caterpillars, and seeds, and nest in holes in ( mostly conifer ) trees.
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