Male Mallards, Mating

Male Mallards, Mating

Observation - Male Mallards, Mating - UK and Ireland. Description: Both these birds seem to be males, though the bird below has a paler bill. Anyone know what's going on here? Is it a mature male and a young bird, perhaps from last year?

Both these birds seem to be males, though the bird below has a paler bill. Anyone know what's going on here? Is it a mature male and a young bird, perhaps from last year?