Cambridgeshire Police were called on 22 August to reports of dead birds that had been found mutilated in the High Street, St Neots.
A woman and a man, both in their 20s, have been arrested on suspicion of a racial/religious public order offence.
They remained in custody, police said.
The arrested woman was 21 years old and from Baldock, Hertfordshire, while the man was aged 23 and from Chatteris in Cambridgeshire.