When Malawi went decimal, the corn cob on the shilling and the elephants on the florin were transferred to the 10 tambala and 20 tambala respectively. This made sense, because a shilling was equal to 10 tambala in value, therefore a florin was equivalent to 20 tambala.
Curiously, the cockerel on the six pence was not transferred to its decimal equivalent, the 5 tambala, which was occupied by a purple heron instead. However, the cockerel ended up on the lowly bronze 1 tambala. Logic would have suggested that the new 1 tambala denomination was given to the new design of the heron, while the cockerel remained on the 5 tambala, but this was not the case.
The transfer of designs from predecimal sterling coinages to decimal coinages is an interesting story in itself. To read more about it, see:
The pound: predecimal to decimal design continuity