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The seaside sparrow is distinguished from other sparrows by its overall gray coloring, large size, and long, conical bill. Sexes are alike with distinct yellow markings above the eye, on the supercilium (stripe running from beak to above eye), and on the edge of the wing at the wrist.

The sparrow was listed as endangered in 1967 due to its limited range and habitat threats caused by drainage of the Everglades south of Lake Okeechobee, mainly for agriculture and flood control, as part of the Central and South Florida Project (C&SF Project).Nov 27, 2020

Habitat. MacGillivray's seaside sparrows spend their entire life in coastal salt and brackish marshes in South Carolina, Georgia, and Florida. In South Carolina, they breed in lower elevation areas of high marsh and in managed impoundments, which are often brackish and non-tidal.

The diet of the Cape Sable seaside sparrow primarily consists of spiders, beetles, caterpillars, grasshoppers, grass, and sedge seeds.

A medium-sized sparrow at 14–16 centimetres (5.5–6.3 in), it has distinctive plumage, including large pale head stripes in both sexes. Its plumage is mostly grey, brown, and chestnut, and the male has some bold black and white markings on its head and neck.

Explanations range from increased predation by magpies, sparrowhawks and house cats; to a lack of nesting sites (holes and crevices) in modern buildings; to pollutants in unleaded fuel and electromagnetic radiation from cellphones.Oct 5, 2013

There are nine recognized subspecies. Two of the subspecies, the Cape Sable seaside sparrow and the recently extinct dusky seaside sparrow (Ammodramus maritimus nigrescens), occurred in isolated and restricted ranges (Curnutt 1996), and were once considered separate species (AOU 1983).

Luke records that five sparrows were sold for two pennies (Luke 12:6). This meant the buyer received the fifth sparrow for free because one sparrow had no value. Imagine, even with all the things going on in the world at any given time, God knows when one sparrow – however worthless in man's eye – falls to the ground.Dec 15, 2018

A baby sparrow eats whatever his parents give him to eat, which means he's eating the same things they are. The house sparrow is opportunistic in his dining, eating whatever's available. Commercial birdseed and discarded food will work, as do various grasses, ragweed and seeds he comes across.