Same here, I'll let you know when my brain stops hurting.

It's parallel to "the dress given to the girl ripped".

There is an ambiguity allowing for a different parse, interpreting "the barn fell" as a fell associated with the barn: https://en.wiktionary.org/wiki/fell#Etymology_3

But that one isn't intended.

A whole lot of "climbing catfish" were filmed in the act of scaling a waterfall.

1) There are species of small "catfishes" (on Asia or Australia if I remember correctly) known to climb waterfalls in rainforests. We are talking about > 100m long fully vertical waterfalls.

2) In fact, they aren't catfishes. Belong to a big family of mainly marine fishes called gobies. Totally different orders. Should be named climbing gobies.

3) They do it for the same reason as Salmons do: to reproduce in freshwater.

4) But unlike salmons they don't swim or jump. They climb the slippery rock wall like a freestyle climber, using the suction cups in their belly that gobies have (pelvic fins transformed), and their other fins and tail to propel

5) Somebody filmed those fishes climbing.

The catfish were the ones filming.