It's about one-seventieth as heavy as an Elephant.
In other words, the weight of an Elephant is 71 times 3,000 ounces.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 220,000 ounces. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 140,000 ounces
It's about one-seventy-fifth as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 77 times 3,000 ounces.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 230,000 ounces while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about 85 times as heavy as a liter of Water.
In other words, 3,000 ounces is 85.04619 times the weight of a liter of Water, and the weight of a liter of Water is 0.01175832 times that amount.(fresh; 4° C / 39.2° F; maximum density)
Contrary to popular belief, 1 liter (0.0.264172052358148 gal) of water at 4° C / 39.2° F (its point of maximum density) weighs 35.274950 ounces rather than 1 kg exactly. The total volume of water on the planet Earth is about 13,590,000,000,000,000,000 (13.59 quntillion) L (3,590,000,000,000,000,000 gallons).
It's about one-one-hundred-fiftieth as heavy as an Anchor of a Cruise Ship.
In other words, 3,000 ounces is 0.00753 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 133 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 399,000 ounces. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about 150 times as heavy as a Basketball.
In other words, 3,000 ounces is 136.363636360 times the weight of a Basketball, and the weight of a Basketball is 0.0073333333335 times that amount.(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 22 ounces. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about 200 times as heavy as a Football (Soccer).
In other words, the weight of a Football (Soccer) is 0.005 times 3,000 ounces.(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 14 ounces and 16 ounces. An artifact on display at the Smith Art Gallery in Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
It's about 200 times as heavy as a Football (American).
In other words, 3,000 ounces is 206.89655172410 times the weight of a Football (American), and the weight of a Football (American) is 0.004833333333334 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 14 ounces and 15 ounces. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.