Rabbits spawn in consistent groups

I am exploring a world created on 1.8 pre2 and am now using 1.8 pre 3.

For my world type I selected large biomes.

Every time I come across some rabbits while exploring the terrain, there is always 1 adult rabbit and 2 baby rabbits. The rabbits are of the different skin types so that is normal.

But 1 adult rabbit and 2 baby rabbits is this normal?

Seed: 305442117

Rabbits: 2000, 68, 339

Rabbits: 1303, 72, -3

Rabbits: 1271, 72, 17

Rabbits: 1250, 80, -33

Rabbits: 1061, 78, 36

Rabbits: 1026, 80, 63

Rabbits: 920, 84, 113

Rabbits: 923, 74, 147

Rabbits: 1207, 64, 753

Rabbits: 1330, 67, 949