First, more than a few of those college students probably weigh more than 250lb.
Second, baby elephants are only the heaviest babies *on land*. Most baby whales weigh far more than 250lb e.g. the blue whale calf weighs between 5000 and 6000lb at birth (and gains weight at the rate of one baby elephant equivalent every day).
Wow.
The meme says “on Earth”, as in land.