Narrated Aisha, Ummul Mu'minin:
The Messenger of Allah (ﷺ) said to me:
Have the mugharribun been seen (or some other word) among you?
I asked: What do the mugharribun mean?
He replied: They are those in whom is a strain of the jinn.
Sunan Abi Dawud 5107
What did the Prophet Muhammed mean by a 'strain' of the jinn? Is it physically or in behavior? If physically, how would inter-species copulation be possible?