Vulnerable kittens need protection long before they find a home. Today is National Kitten Day, a day that celebrates kittens while drawing attention to the many young cats still waiting for safety, care, and a home. Nearly half of all cats entering U.S. shelters are kittens, with about 1.58 million admitted in a single year. Earlier this year, a two-month-old kitten named Elmer was brought to a Texas shelter after he was found covered in glue and close to death. Rescuers spent hours…