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By DAVID SPECTOR

Mallards are the ducks most likely to be seen in park ponds. The male is readily identified by his green head and narrow white neck-band; the brown female, superficially similar to the females of several other duck species, shares the male’s...

By DAVID SPECTOR

Most vertebrates — the large group of animals that includes humans — have many features in common, but some oddball groups have lost some of those characteristics. For example, snakes have lost their limbs, but they retain most of the other features...

By DAVID SPECTOR

If you sit on a city park bench you’re likely to see birds, especially house sparrows. This species, native to Europe and Asia, was first introduced into North America in 1851 and is now common where farms or cities provide both grain on the ground...