Who lie on beds of ivory, And stretch themselves on their couches, And eat the lambs out of the flock, And the calves out of the midst of the stall;
"Lambs out of the flock ... calves out of the ... stall ..." This was a custom severely frowned upon by God's prophet, because it was an extravagant and unnecessary waste.  The result was that the flocks and herds were diminished.  The current society is guilty of a similar waste in their extravagant taste for caviar, which has practically destroyed the whole species of the sturgeon from which the fish eggs are derived.  It would appear that Amos was particularly outraged by their eating of the lambs!