Deinosuchus lived during the Late Cretaceous, ~82 - 73Myrs ago. The first remains were discovered in North Carolina in the 1850s, and the genus was first described in 1909. --WP

A modern comparison:

When Deinosuchus Ruled the Earth - Hakai Magazine:

Although Deinosuchus was far larger than any modern crocodile or alligator, with the largest surpassing 9m (30 ft) in length, its overall appearance was fairly similar to its smaller relatives, but with a proportionally longer skull than modern crocodilians. It had large, robust teeth built for crushing, and its back was covered with thick hemispherical osteoderms (bony scales). One study indicated Deinosuchus may have lived for up to 50 years, growing at a rate similar to that of modern crocodilians, but maintaining this growth over a much longer time.

Deinosuchus prehistoric crocodilian hunting illustration - Natty Geo:

I reckon you're gonna need a bigger knoif, Mick!

Crikey!

That Dino SUCKus.

Bloody crock mate

Why are there modern-looking birds in the first one?

There were a lot of modern-looking things millions of years ago. Loads of insects looked very similar. Sharks. Trees and flowering plants. Galliformes (chickens & relatives) were very similar genetically, AFAIK.

Sometimes it's a case of a lineage evolving relatively little over time, and other cases it could be very different species that just happened to look alike, adapting to a similar environ.

For example, placental mammals and marsupials diverged over 100Myrs ago, and generally looked a lot different from their modern counterparts, and yet they each developed subgroups over time that look remarkably like each other. For rodents, there are marsupials that look remarkably rodent-like, with the same going for cat-like predators.

Blimey! I din know we hid a North Carloina!

Seriously, those look ready to pinch some chips

Right?!

I love that the albertosaurus looks like a cartoon housewife that's seen a mouse

"That's some mouse!"