We have seen many birds sitting on distribution line mainly during winter season but not on the transmission line. The reason behind is that electromagnetic fields around high voltage wires will concentrate on sharp points. This concentration is called corona.
Due to corona effect, birds fly to the wire, they can feel the electromagnetic fields in their beak and talons and when they feel it they don't like too much and will fly away.
The electromagnetic fields on higher-voltage(transmission)lines are more intense than they are on distribution lines you see everywhere in town.
Actually, the birds like the distribution wires because the AC current in the distribution wire will warm the wire up to provide a suitable place for bird to sit.
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