diff --git a/R/merge_camtrapdp.R b/R/merge_camtrapdp.R
index 6e63a030..b77f38a7 100644
--- a/R/merge_camtrapdp.R
+++ b/R/merge_camtrapdp.R
@@ -94,6 +94,20 @@ merge_camtrapdp <- function(x, y) {
   }
   prefixes <- c(x$name, y$name)
 
+  # Warn if samplingDesign of x and y are different
+  if (x$project$samplingDesign != y$project$samplingDesign) {
+    cli::cli_warn(
+      c(
+        "{.arg x} and {.arg y} have a different
+         {.field x$project$samplingDesign} ({.val {x$project$samplingDesign}} vs
+         {.val {y$project$samplingDesign}}).",
+        "i" = "The sampling design of {.arg x} will be used
+               ({.val {x$project$samplingDesign}})."
+      ),
+      class = "camtrapdp_warning_different_sampligndesign"
+    )
+  }
+
   # Create xy from x
   xy <- x
 
diff --git a/tests/testthat/test-merge_camtrapdp.R b/tests/testthat/test-merge_camtrapdp.R
index b0075148..8709038b 100644
--- a/tests/testthat/test-merge_camtrapdp.R
+++ b/tests/testthat/test-merge_camtrapdp.R
@@ -8,6 +8,20 @@ test_that("merge_camtrapdp() returns a valid camtrapdp object", {
   expect_no_error(check_camtrapdp(merge_camtrapdp(x, y)))
 })
 
+test_that("merge_camtrapdp() returns warning on non-identical samplingDesign", {
+  skip_if_offline()
+  x <- example_dataset()
+  x$name <- "x"
+  y <- x
+  y$name <- "y"
+  y$project$samplingDesign <- "opportunistic"
+
+  expect_warning(
+    merge_camtrapdp(x, y),
+    class = "camtrapdp_warning_different_sampligndesign"
+  )
+})
+
 test_that("merge_camtrapdp() returns error on missing/invalid/duplicate dataset
            name(s)", {
   skip_if_offline()
@@ -151,6 +165,7 @@ test_that("merge_camtrapdp() returns the expected datapackage.json when merging
    download.file(y_url, zip_file, mode = "wb", quiet = TRUE)
    unzip(zip_file, exdir = temp_dir)
    y <- read_camtrapdp(datapackage_file)
+   y$project$samplingDesign <- "targeted" # To avoid warning
    xy <- merge_camtrapdp(x, y)
    xy$created <- NULL