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DENVER - April brings showers, May brings flowers and June is all about the kittens. The American Humane Society designated June "Adopt-a-Cat Month" due to the thousands of new kittens being born in already crowded shelters across the country.

Pet experts say cats are seasonal breeders. They generally breed in January and February, which means the majority of cats give birth in May and June. This time of year, shelters are flooded with new kittens and older cats looking for a home.

Almost Home Adoptions is a local shelter in Denver. It says those who choose to adopt help combat pet overpopulation and open spaces for new cats. Like many other shelters across the state, Almost Home Adoptions offers potential owners the ability to foster kittens before they're adopted out permanently.

If you're unable to adopt, but still want to help with the cause, shelters say they're always in need of donations and volunteers to help care for the kittens.

The American Humane Association along with the American Veterinary Medical Association and CATalyst Council created a checklist for families looking to adopt.

1. If you're thinking about adopting a cat, consider taking home two.
2. Find a cat whose personality compliments yours.
3. Pick out a veterinarian ahead of time and schedule a visit within the first few days following the adoption.
4. Make sure everyone in the house is prepared to have a cat before it comes home.
5. Budget for the short- and long-term costs of a cat.
6. Stock up on supplies before the cat arrives.
7. Cat-proof your home.
8. Go slowly when introducing your cat to new friends and family.
9. Be sure to include your new pet in your family's emergency plan.
10. If you're considering giving a cat as a gift, make sure the recipient is an active participant in the adoption process.