Later editions of D&D have retconned kobolds into reptiles,
Retconned? They went from undescribed in OD&D to scaly egg-layers, with no other stops on the way. References:
1). Advanced Dungeons & Dragons Monster Manual, 1977, p.57.
"If 200 or more kobolds are encountered in their lair there will be the following additional creatures there: 5-20 guards (as bodyguards above), females equal to 50% of the total number, young equal to 10% of the total number, and 30-300 eggs."
"The hide of kobolds runs from very dark rusty brown to a rusty black. They have no hair."
(Also see the kobold artwork on pp. 57 & 58, which clearly shows scales.)
2). Dungeons & Dragons Basic Set, 1981 (Moldvay), p.B37
"They have scaly rust-brown skin and no hair."
3). Dungeons & Dragons Basic Set, 1983 (Mentzer), Dungeon Masters Rulebook, p.32
"They have scaly, rust-brown skin and no hair."
4). Advanced Dungeons & Dragons Monstrous Compendium Volume 1, Kobold page
"Barely clearing three feet in height, kobolds have scaly hides that range from very dark rusty brown to a rusty black."
"In a lair there will be 5-20 (5d4) bodyguards, females equal to 50% of the males, young equal to 10% of the males and 30-300 (3d10x10) eggs."
5). Dungeons & Dragons Rules Cyclopedia, p.187
"They have scaly, rust-brown skin no hair."
6). Advanced Dungeons & Dragons Monstrous Manual, p.214
"Barely clearing three feet in height, kobolds have scaly hides that range from very dark rusty brown to a rusty black."
"In a lair there will be 5-20 (5d4) bodyguards, females equal to 50% of the males, young equal to 10% of the males and 30-300 (3d10x10) eggs."