The special, kicking off Monsters Week on Animal Planet, averaged 3.6 million viewers, according to Nielsen — well above the previous record holder for the network, the 2.8 million who watched “Dragons: A Fantasy Made Real” in 2005. “Mermaids: The New Evidence” was a follow-up to last year’s “Mermaids: The Body Found,” which opened to nearly 2 million viewers.
In addition to total viewers, “Mermaids: The New Evidence” also set network records in most other categories, including adults 18-49 and key male demos.
For its 10 p.m. hour on Sunday, “Mermaids: The New Evidence” was the No. 1 cable network (excluding sports) in adults 25-54 (1.9 million) as well as women 25-54 (809,000).