Kemp's Ridley turtles have a distinct and unique nesting habit. Large groups of female turtles gather off specific nesting beaches in the state of Tamaulipas, Mexico, although a few have been recorded nesting in small numbers in parts of the U.S. Wave upon wave of females come ashore and nest in what is called an "arribada" - meaning "arrival" in Spanish. Female Kemp's Ridleys nest from May to July, and lay two to three clutches of approximately 100 eggs. These eggs incubate for 50-60 days and when the hatchlings emerge they weigh about half an ounce (14 grams) and only measure 1.5 inches (3.8 cm). They are the only sea turtle species that nests predominantly during the daytime.