Is it normal to not spot any wildlife at the hanging bridges in La fortuna?

Hi everyone, we arrived in La fortuna two days ago and have one more full day before heading to Uvita. So far we have gone to La fortuna waterfall, Arenal 1968 and the hanging bridges.

In most places we’ve been to, even in the back yard of our Airbnb we have spotted so many beautiful birds, sloths, frogs and insects. However, what shocked me a bit is that when we went to the hanging bridges we couldn’t spot anything besides a few birds.

When we first stared our hike through the bridges, I was extremely excited because I could hear howler monkeys from a distance which is probably the one thing I’m most excited to see. But sadly, we couldn’t spot any monkey, frogs, snakes during our entire walk.

Is it common to not see anything sometimes? We did an early hike around 7am.

Is there anywhere you recommend if I wanted to see howler monkeys?

Thank you!