animal

avian

baby

background

beak

birds

black

blue

cable

column

columnar

conductor

crows

directline

electric

electrical

electricity

equipment

facilities

feathers

flight

flock

fly

group

high

humming

lead

line

main

outside

overhead

pillar

pole

post

power

project

sit

sky

sparrows

swallow

swift

telegraph

telephone

tiled

tiling

transmission

wildlife

wings

wire

wrens