A typical day in the life of the San Diego Zoo's bachelor brothers, 20-year-old Maka, 13-year-old Mandazzi, and 9-year-old Ekuba includes both some outdoor exhibit time and indoor bedroom time. On this sample day, they are scheduled to go outside in the morning, and our breeding troop will go out in the afternoon. After an early morning wake up to check on how everyone is feeling, a heart-healthy breakfast of low-starch biscuits and their favorite banana leaf browse, it's time for keepers to head out to clean and set up the exhibit for the day. Keeping the boys active and engaged is a top priority; it’s one of the highlights of my day and most certainly theirs, too! We have a wonderful and creative team of enrichment volunteers that keep our gorillas well-stocked with fun items like painted gourds, boxes, papier-maché and burlap bags, perfume-scented pine cones, bamboo cups for gelatin or peanut butter, palm husk baskets and comfy hay beds to sleep on (they even take special requests for birthday parties or upcoming holiday themes!)In addition to the enrichment, we also set out plenty of fresh cut browse. The boys get a total of 12 branches of a variety of browse delivered daily by our hard-working forage team. Willow, mulberry, and rusty-leaf fig are always a huge hit! After we top off the exhibit with a liberal sprinkling of cereal to increase foraging, it's time for the boys to head outside. As is the case with all of our primates, the gorillas are part of an extensive training program that allows us to give them excellent medical care. On their way outside, each one of the boys stop in a chute and are asked for a variety of behaviors that allow us to get a good look at them one-on-one and address any issues. For example, we might notice Mandazzi has a hang nail and dry heels, so we file the nail and apply lotion to his feet; Ekuba needs a quick tooth brushing; and Maka has a minor cut on his arm that we will irrigate to promote faster healing. These are a just a few of the over 20 behaviors the gorillas know. This individual time keeps them in top form and develops an invaluable relationship of trust between gorilla and keeper. And it doesn't hurt that they get yummy fruit and nut pieces hand fed to them during these daily check-ups! Once outside, the boys enjoy their enrichment and foraging time, check in with a few devoted friends on the other side of the glass (our guests!) and settle in for a mid-morning nap next to the rushing sound of the waterfalls. Like all primates, gorillas like to eat throughout the day, so every couple of hours more food and treats are distributed by a keeper from the roof of the building. The boys each have their favorite "spot" to be in while the food is delivered. Maka usually prefers to hang back either on the "point" or along the side near the waterfalls to keep an eye on things. Ekuba takes the requisite spot between his big brothers, and Mandazzi, ever the foodie, likes to be front and center catching all of his food like a pro center fielder. In addition to fresh produce like yams, broccoli, snap peas, jicama. and green peppers, the boys get treats like peanut butter covered pine cones or Crystal Light-flavored ice treats. This enrichment requires a lot of time to enjoy, so they are occupied until their early afternoon naptime rolls around. By mid-afternoon, when the bedrooms have been cleaned and the bedding re-fluffed, it's time for the boys to come in so that our other troop can head outside. Mandazzi is almost always the first one in. His eager attitude has made him our star patient in training for voluntary cardiac ultrasounds. He has an appointment this afternoon and our veterinarian is already staging the scene. Heart disease is a major concern for adult male gorillas. To help with early identification and treatment of this disease, all four adult male gorillas at the Zoo are trained to allow us to "see" how their hearts are functioning. Mandazzi comes up to the front of his room where the veterinarian and keeper are set up, positions himself with his chest flush against the mesh separating his space from ours, and an ultrasound probe is placed against his chest to capture images while a keeper gives him treats. Depending on the position and length of time we need him to hold the position, keepers offer the gorilla juice from a squirt bottle, applesauce from a spoon, or hand feed pieces of fruit and nuts. Mandazzi did great and three different angles of his heart were recorded today. He gets a few more treats from a happy veterinarian and then it's time for second lunch and more fun enrichment! While inside, the gorillas often get very messy enrichment. There are piles of shredded paper or pine shaving with raisins to dig through. Magazines are sprinkled with seeds and spices and ready to be torn up. Often, their produce and hay is fed out in puzzle feeders that take time to manipulate. With a nature DVD playing on their wall-mounted flat screen TVs and a pile of cardboard boxes to dig through, the boys are busy right up until late afternoon nap time. After a power nap, the boys get another round of browse to strip and eat while the day keeper finishes her/his tasks and updates the evening keeper that takes over the area. As the sun sets, the boys get ready for their evening routine— and more food! Each of the boys has their own room at night. They are fed in their separate rooms to make sure everyone gets their fair share. Afterwards, the doors between rooms are opened wide enough for little, peacekeeping Ekuba to mingle. This allows for some socializing but still gives both of the big boys a peaceful night’s sleep without worrying about the other sneaking into "their" room while they are relaxing. Maka is the troop leader, being the oldest brother, but Mandazzi already outweighs him and we are always aware of the possibility of a coup. No such drama tonight, however. All is quiet as bedding is adjusted and sleepy boys are ready to settle in for the night. After all, tomorrow starts with an early morning keeper wake up call, and big bowl of heart healthy biscuits. Nerissa Foland is a senior keeper at the San Diego Zoo. Read her previous blog, Oh, joy—It's a Boy!