On the Mallard in front you can see the distictive speculum: blue-purple with black and white borders. We can iD these Mallards as nonbreeding males by their yellow bills with a black dot (rather than the orange bills of the females) and by their grayish necks (rather than the green necks of breeding male Mallards).
Photos of birds, nature & travel: U.S.- Canada-Costa Rica-Panama-Australia-New Zealand-Fiji-South Africa-Zambia-Zimbabwe-Botswana-Trinidad & Tobago- Mexico-Bahamas-Jamaica-Grand Cayman-Portugal-Italy-Greece-Turkey-Dominican Republic-Columbia- Guatemala-St Kitts-Guadaloupe-Barbados-Grenada-Aruba-Bonaire