Wolf Pups (1) To establish a wolf pack in the wild, a male and a female wolf must first form what is called a breeding pear. (2) A female wolf is pregnant for about two months. (3) She gives birth to one to eleven pups, newborn wolves are tiny and defenseless creatures. (4) Wolf pups are also blind and deaf. (5) They do not even open their eyes until they are about two weeks old. (6) At birth the average pup weighs just one pound. (7) At first, their sight is very poor, but it gradually improves until they have clear vision as adults. (8) When the pups are two to three months old, their eyes begin to change color from blue to yellowish-gold. (9) Their hearing has developed too.

(10) When they are still very young, pups feed on their mother's milk several times a day. (11) Females spend a great deal of time with their young after they are born, but other wolves will help mothers as well. (12) The entire wolf pack, when mother wolves are out of the den, steps in to protect the pups from threats. (13) Members of the pack might also do things such as lick the pups to stimulate them and keep them clean.

(14) During the first fourteen days of their lives wolf pups grow rapidly. (15) This is known as the neonatal period. (16) Males usually add a little over three pounds a week. (17) Females gain an average of two and a half pounds per week. (18) The rate of this weight gain slows down to about one pound per week when the pups reach twelve weeks old. (19) Growth will continue until wolf pups reach one year old. (20) Wolves are still called pups when they are about one year of age. (21) One-year-old wolves are nearly full-grown. (22) Full-grown wolves weigh an average of 60 to 100 pounds.

(23) By the time wolves are nine months old, they had spent time learning how to perform a variety of adult tasks. (24) These include helping their pack hunt for food, marking their territory, and keeping watch over that area. (25) Turning two years old means that wolves often leave their home packs. (26) They are now young wolves off in search of mates. (27) The goal for a young wolf and its mate is to breed. (28) Then, the two of them will begin the cycle again and create their own new wolf pack.
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What is the BEST way for Declan to combine sentences 20 and 21 to add more sentence variety to his report?

Although wolves are still called pups at about one year of age, they are nearly full-grown.
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Wolves are still called pups when they are nearly full-grown around one year of age.
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One-year-old wolves are nearly full-grown, in spite of that they are still called pups.
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When wolves are about one year old, they are still called pups. This is silly because they are nearly full-grown.