How to protect my PC pipes from birds?

I’ll be brief. I have a brand-new AC, I live on the top floor and the outer is on the roof. But pigeons and crows are taking the insulation foams of the connecting pipes away for their nests. It has become like a funnel and as it is monsoon when the rain starts, rainwater floods the inner unit which overflows into... show more I’ll be brief. I have a brand-new AC, I live on the top floor and the outer is on the roof. But pigeons and crows are taking the insulation foams of the connecting pipes away for their nests. It has become like a funnel and as it is monsoon when the rain starts, rainwater floods the inner unit which overflows into the room.

Any affordable creative idea to solve this will be greatly appreciated.
Write as quick as possible, this is serious - So please no jokes - please.
Update: How to protect my AC pipes from birds?
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