Some birds like to live in groups with one another. This may be due to the similar food habits of some different birds. Other reasons may be similar nesting patterns. I have observed that in the river beds which is full of brownish sand and assorted sized pebbles birds like Paddy Field Pipits, Crested Larks and Ashy Crowned Sparrow Larks cohabit. One more reason seems to be that their colours match the sand of the bed creating a perfect camouflage.
One day we found together Ashy crowned Sparrow Larks , crested Larks and pipits forage together in the Ghaggar river bed perhaps they are terrestrial birds. I could take a photo of Juvenile Ashy Crowned Sparrow Lark ( in Front) and Paddyfield Pipit in the back in the Ghaggar River passing near Panchkula city of Haryana in India.